JP2882704B2 - Reciprocating drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device for reciprocating and stopping a load by using a one-way rotating driving source.

[0002]

2. Description of the Related Art Conventionally, as an example of a load that reciprocates, there are a document table and a mirror table of a copying machine. The original table drive and the mirror table drive require a constant speed forward movement and a reciprocating backward movement in synchronization with the drive of the main body such as the image carrier and the transport roller. As a driving device for realizing this, a one-way rotating motor also serving as a main body side driving is used as a driving source, and two spring clutches for transmitting and disconnecting driving in forward and backward directions and a solenoid for switching are provided. A mechanism combining up to two gear trains has been used.

[0003]

However, a reciprocating drive using a spring clutch has the following problems, and a reciprocating drive not using a spring clutch has been desired. (1) The number of parts of the spring clutch itself is large, and when the accuracy of each part varies, phenomena such as noise, slippage, spring breakage, and twisting have occurred. Therefore, it was difficult to control the accuracy of each component. (2) Due to the large volume and weight (so-called iron lump) of the spring clutch, especially in a small copying machine,
The space for the entire drive device is increased, which is contrary to the miniaturization of the device.

Further, with the frequent use of precision parts, the apparatus becomes expensive, and in order to aim for not only miniaturization but also inexpensive equipment,
It was contrary. (3) The timing at which the spring clutch operates is likely to vary due to the engagement between the spring and the winding drum of the clutch. In particular, when used for moving the platen or the like, the stop position of the platen may be greatly shifted due to variation in switching of the clutch.

[0005]

According to the present invention, there is provided a reciprocating drive apparatus for a copying machine of a manuscript table moving type, wherein a first output gear is rotated in a forward direction. A first gear train, a second gear train for rotating a second output gear in a reverse direction, a switching ring driven by engaging with the first output gear or the second output gear, A pinion gear that engages with the switching ring to reciprocate the platen, a switching mechanism that engages and separates the first output gear or the second output gear and the switching ring, A detection lever for detecting a position, a cam provided on the document table that comes into contact with and separates from the detection lever, a solenoid that activates the switching mechanism, and a control circuit that activates the solenoid according to the proximity of the detection lever. Having.

It is preferable that the first output gear is provided with a driving claw that engages with the switching ring, and the second output gear is also provided with a driving claw that engages with the switching ring.

[0007]

In the present invention having the above structure, the separation between the detection lever and the cam of the document table is transmitted to the control circuit, and the control circuit operates the solenoid, and the solenoid operates the switching mechanism. Then, the switching mechanism engages and separates the first output gear or the second output gear and the switching ring, rotates the pinion gear forward or reverse, and reciprocates the document table.

When the first gear is provided with a driving claw that engages with the switching ring, and the second gear is provided with a driving claw that engages with the switching ring, torque is transmitted more than necessary. Then, the drive pawl is disengaged from the first or second output gear and the above-mentioned switching ring, and the torque limiter operates.

[0009]

【Example】

(Embodiment 1) The present invention will be described below with reference to the illustrated embodiment.

FIGS. 1 to 8 relate to a first embodiment of the present invention. FIG. 1 (a) is a cross-sectional explanatory view of a copier incorporating a driving device of the present invention, and FIG. 1 (b) is a copier. FIG. 1C is a plan view of a document table of a copying machine.

1 (a) and 1 (b), reference numeral 50 denotes a main body of a copying machine of a manuscript table moving type. 51 (shown in a plan view in FIG. 1C) is provided so as to be able to reciprocate right and left by the accuraride rail 24. Light emitted from the illumination lamp 52 is reflected on the original surface, passes through the fiber lens 53, and passes through the photosensitive drum 54.
Is formed on the original. The exposure image on the surface of the photosensitive drum 54 is transferred to the transfer paper conveyed by the registration roller 60 via the developing device 55 and the transfer charging device 56. Then, the toner remaining on the photosensitive drum 54 is cleaned by the cleaner 57. After the transfer, the transfer paper (not shown) is fixed by the fixing device 59 and discharged outside the apparatus. Exhaust heat fan 5
8 discharges the heat consumed by the fixing device 59. Reciprocating drive 61
Is provided at the back side of the copying machine main body 50, and rotates the pinion gear 22 forward or backward to move the document table 51 forward or backward as described later. The detection lever 62 is mounted at a position where it can be engaged with the cams 21 a and 21 b provided on the back surface of the document table 51, and switches between normal rotation and reverse rotation of the pinion gear 22 by engaging with the cams 21 a and 21 b.

FIG. 1C is an explanatory plan view of the document table 51. On the back side of the rack base 80 (shown by a two-dot chain line), the accuride rail 24, the rack 23, and the cams 21a and 21b are fixed at the illustrated positions. Both ends of the cams 21a and 21b are formed in an inclined shape, and portions other than both ends are formed horizontally. The length of the horizontal portion of the cam 21a is formed to be about twice as long as the length of the horizontal portion of the cam 21b, and the leading and trailing ends of the document table 51 can be detected by one sensor as described later. ing.

FIG. 2 shows a document table 51, cams 21a and 21b,
FIG. 5 is an explanatory sectional view of a detection lever 62. When the document table 51 is retracted by a predetermined amount from the home position (shown in FIG. 1B) (shown by a solid line in FIG. 2), the horizontal portion of the cam 21a pushes down the tip of the detection lever 62, and the detection lever 62 is turned on the support shaft 62a.
Around the counterclockwise direction. By the rotation of the detection lever 62, the reciprocating drive device 61 switches from the backward movement state to the forward movement state, and the document table 51 starts to move forward. When the cam 21b pushes down the detection lever 62, the reciprocating drive 61 switches to the reverse state. After moving backward by a predetermined amount, the document table 51 stops at the home position.

Next, the reciprocating drive 61 will be described with reference to FIGS. 3 and 5 are plan explanatory views of the reciprocating drive device 61, and FIGS. 4 and 6 are cross-sectional explanatory views. FIG.
(A) is a development explanatory view of the driving claw 8a and the claw portion 9a, and FIG.
(B) is a perspective view of the gears 8, 10, 12 and the switching ring.

3 and 4, the front plate 1 and the back plate 2 are parallel to each other and are screwed to a bottom plate (not shown). Gears 3, 5, and 6 are attached via a pin 7 to the drive shaft 4 rotatably supported by the front plate 1 and the back plate 2 so as to rotate integrally.

The fixed shaft 11 is fixed between the front side plate 1 and the back side plate 2, and gears 8, 12, 10 are loosely fitted to the fixed shaft 11. A gear 20 is rotatably mounted on the rear plate 2 by a shaft 20.
a.

The gear 5 and the gear 8 as the first output gear always mesh with each other to form a first gear train G1, and the gear 6 and the gear 20 and the gear 20 and the gear 10 as the second output gear.
Always mesh with each other to form the second gear train G2. Therefore, when the gear 3 rotates clockwise when viewed from below in FIG. 3, the gear 8 rotates counterclockwise, and the gear 10 rotates clockwise. A switching ring 9 is provided on the rear R side surface of the gear 8.
A drive claw 8a is formed which meshes with the arm 9b of the first member to transmit torque. A drive claw 10a that engages with a claw 9c described later to transmit torque is formed on a side surface on the front F side of the gear 10. The gear 12 is a pinion gear 22 (FIG. 1B)
(Shown). A substantially square hole 12a is provided on the side surface of the gear 12 every 90 degrees. The four arms 9b of the switching ring 9 are loosely fitted in the holes 12a, and the switching ring 9 and the gear 12 rotate integrally during driving. A claw 9a is formed at the tip of the arm 9b, and a claw 9c is formed on a side surface opposite to the arm 9b.

The switching ring 9 has a groove 9d formed therein.
The leading end 13d of the switching lever 13 is loosely fitted in d.
As described later, the claw 9c moves when the distal end portion 13d moves to the back side.
Meshes with the claw 10a of the gear 10, and the claw 9a meshes with the driving claw 8a of the gear 8 when the distal end 13d moves toward the near side.

The switching lever 13 is provided at the bent portion 1 of the front side plate 1.
b is loosely fitted to the pin 1c implanted in the b. Switching lever 1
Springs 16 and 17 for restoring the switching lever 13 to the neutral state are hung on the right end 13a of 3. Spring 1
The other end of 6 is fixed to the rear plate 2, and the other end of the spring 17 is fixed to the front plate 1. An engagement pin 13b is provided at a central portion of the switching lever 13, and an engagement portion 13c is provided at a lower right portion of the switching lever 13. When the engaging portion 13c is pressed in the direction of arrow B as described later, the switching lever 13
Rotates clockwise, the switching ring 9 moves to the rear R side, and switches to the reverse state. When the engagement pin 13b is pressed in the direction opposite to the arrow B, the switching lever 13 rotates counterclockwise,
The switching ring 9 moves to the front F side and switches to the forward state.

The lever 15 is a pin 1
5a, and the upper end 15b of the lever 15 is
In the square hole 14b. The lower end of the lever 15 is in contact with the engaging portion 13c of the switching lever 13.

The lever 14 has an engaging pin 14a at the left end, and a square hole 14b bent in a key shape at the right end.
An engagement pin 14c is provided on the left side of the square hole 14b. Further, a concave hole 14 is provided on the left side of the engagement pin 14c.
d is formed. A spring 29 is provided at the right end of the lever 14.
Is hung. The other end of the spring 29 is hung on the end of the rear side plate 2, and the lever 14 is constantly pulled obliquely upward to the right. The distribution pin 2a is loosely fitted in the concave hole 14d of the lever 14.

A solenoid 19 is fixed to the lower end of the rear plate 2, and the plunger 19 a of the solenoid 19 and the lever 14 are connected by the lever 18. Lever 18
Is loosely fitted to the pin 18a implanted in the rear side plate 2, and when the solenoid 19 is energized, the lever 14 moves in the direction of arrow C.

Here, the groove 9d, the switching lever 13, the pin 1
c, springs 16, 17, 29, levers 14, 15, 18,
The distribution pin 2a forms a switching mechanism C.

The lever 28 is loosely fitted on the fixed shaft 11 and is in contact with the upper right end of the lever 14. At the right end of the detection lever 62, a pin 62a is provided at the front F side and at the rear R side, and the detection lever 62 is supported by the front side plate 1 and the rear side plate 2 so as to be able to rotate around the pin 62a. The depth R of the detection lever 62
A switch 31 attached to a control board 32 (shown in FIG. 1C) as a control circuit disposed on the back R side of the back side plate 2 is provided with an arm 62d.
Turns on and off by the rotation of. An elastic piece 62c is formed below the detection lever 62, and the tip of the elastic piece 62b is in contact with the upper part of the lever 28.

When the detecting portion 62c is pressed by the cam 21a provided on the document table 51, the detecting lever 62 rotates counterclockwise, and the lever 14 is moved to the engaging pin 14a via the elastic piece 62b and the lever 28. 5, is rotated clockwise by α degrees as shown in FIG. When the lever 14 rotates clockwise by α degrees, the engaging pins 14c and 13b are at the same height. At this time, when the solenoid 19 is energized, the engagement pin 1
4c depresses the engagement pin 13b and pushes the switching lever 13 in FIG.
As shown in FIG. Switching lever 1
By the rotation of 3, the forward gears 5, 8, and 12 are driven.

When the solenoid 19 is energized when the cam 2a provided on the document table 51 does not press the detecting portion 62c, the lever 15 rotates counterclockwise and the engaging portion 13c is pressed, and the switching lever 13c is pressed. 13 switches clockwise. The rotation of the switching lever 13 drives the reverse gears 6, 20, and 10 shown in FIGS.

The cross-sectional shape of the claw 10a of the gear 10 described above is as shown in FIG. 7A, and the surface on the side for transmitting the driving force is an inclined surface having a small angle (θ ° = 0 ° to 10 °). is there.
The claw 10a is formed on the side surface of the gear 10 at every 22.5 °. The cross-sectional shape of the claw 9c provided on the side surface of the switching ring 9 is the same as that of the claw 10a.
The two claws are spaced apart by 90 ° and are provided at every 90 °. The gear 8, the gear 12, the switching ring 9, and the gear 10 are shown in FIG.
It is shown as follows.

The on / off of the solenoid 19 is controlled by the switch 3
1 is turned on and off. The switch 31 is provided on a control board 32 (FIG. 1C) provided on the back R side of the back side plate 2.
(Shown). The detection lever 62 is the cam 2
1a and 21b, the arm 62
The tip of d switches the switch 31 from off to on.

The ON / OFF control circuit of the solenoid 19 is controlled by a combination of ON / OFF switching of the switch 31 and a time constant circuit, and the document table moves forward and backward according to the timing and procedure shown in FIG. .

As shown in this embodiment, a load such as a platen is provided outside the apparatus, and when the user mistakenly holds the platen 51 and stops it, or when the place where the apparatus is installed is If the table 51 collides with a wall during operation, the gears are overloaded and the gears may be damaged. Therefore, in this type of apparatus, a torque limiter is often provided in any of the gear trains. In the driving device of the present embodiment, the switching ring 9 moves in a direction away from the driving claw 8a when an overload state occurs due to the inclined surfaces provided on the driving claws 8a and 10a (the switching lever 13 is pushed and bent. ), It is possible to prevent the drive gear from being damaged.

In the above description, the torque limiter is operated on the inclined surface of the driving claw 8a.
It is also possible to use the current flowing through the solenoid 19 that locks the motor 8 as a torque limiter. (Embodiment 2) In the previous embodiment, the solenoid 1 is used during the copying operation.
9 has been described as a constant current type. Next, an embodiment in which a lock mechanism is provided on the lever and the solenoid 19 is energized only at the time of switching will be described with reference to FIGS. Members having the same functions as in the previous embodiment are denoted by the same reference numerals.

9 and 10 are cross-sectional explanatory views of the reciprocating drive device, and FIG. 11 is an explanatory view of the lock mechanism. FIG. 3 is an explanatory plan view of the reciprocating drive device shown in FIG.
Will be described.

The lever 18 rotates about a support shaft 18a,
The plunger of the solenoid 19 is engaged with the lower end, and the lever 14 is engaged with the upper part. A lock pin 18c is implanted at the uppermost part of the lever 14. As shown in FIG. 11, the pawl lever 45 is for engaging the lock pin 18c to hold the lever 18.
Are loosely fitted to the pins 2c implanted in the front side plate 2. The claw lever 45 is biased by a spring 2d to rotate counterclockwise, and is in contact with the pin 2b planted on the front side plate 2.

FIG. 10 shows a state in which the solenoid 19 is once turned on, the lever 18 rotates counterclockwise, and the reciprocating drive device is switched to the reverse state. At this time, the solenoid 19 is in a non-conducting state after conducting once, but the lever 18 is maintained in the state shown in the figure by the claw lever 45 and the lock pin 18c. When the solenoid 19 is turned on again from this state, the claw lever 45 and the lock pin 18
The lever 18 is disengaged from the lever c, and the lever 18 returns to the state shown in FIG.

If the right end of the lever 14 is pushed down by the lever 28 before the solenoid 19 is turned on (similar to FIG. 5), the reciprocating drive device is switched to the forward state.

A hole 45e for loosely fitting the pin 2c is provided at the left end of the claw lever 45, and an elastic member 45d is provided. An approximately 45-degree slope 45a is formed at the right end of the claw lever 45, and a vertical stop surface 4 is formed near the center.
5b are formed. A slope 45c is formed on the left side of the stop surface 45b as shown in FIG.

In this embodiment, the ON time of the solenoid is only at the time of switching, so that wasteful power consumption can be eliminated and energy can be saved.

When the solenoid 19 is turned on, the lever 18 turns counterclockwise, and the lock pin 18c moves leftward in an arc shape. When the lock pin 18c comes into contact with the inclined surface 45a, the claw lever 45 starts rotating clockwise in the figure around the pin 2c. When the lock pin 18c further moves to the left, the claw lever 45 further rotates. Lock pin 1
When 8c passes through the inclined surface 45a, the pawl lever 45 rotates counterclockwise. Here, when the solenoid 19 is turned off, the lever 18 attempts to return to the spring state by the spring 29, but the pin 18c comes into contact with the stop surface 45b (shown in FIG. 11C), and the lever 18 is locked (see FIG. 11C). 10
Illustrated).

When the solenoid 19 is turned on again, the lock pin 18c comes into contact with the slope 45c and pushes the claw lever 45 upward (see FIG. 11 (e)). At the same time when the claw lever 45 is raised to the position indicated by the two-dot chain line, the claw lever 45 rotates counterclockwise (illustrated in FIG.
The engagement between c and the claw lever 45 is released. Solenoid 19
Is turned off again, the lever 18 rotates clockwise and returns (FIG. 9), and the reciprocating drive enters the neutral state.

The on / off control circuit of the solenoid 19 is performed by a combination of the on / off switching of the switch 31 and a time constant circuit, and the document table is shown in FIGS. 12 (a) and 12 (b).
Move forward, back, and stop as shown in (1). (Embodiment 3) In the previous embodiment, the reciprocating drive of the load is performed by combining one solenoid and a lever mechanism. However, a case where two small solenoids are used will be described. Members having the same functions as in the previous embodiment are denoted by the same reference numerals.

FIG. 13 is an explanatory plan view of the reciprocating drive unit, and FIG.
4 is a cross-sectional explanatory view taken along the line XX, all of which are in a neutral state.

A solenoid 71 is provided at a lower right portion of the front side plate 1.
(For forward movement), and a solenoid 72 (for backward movement) is provided at a lower right portion of the rear side plate 2. Switching lever 70
Is a pin 1 planted on a support plate 1b provided on the front side plate 1.
c is rotatably supported. The tip 70c of the switching lever 70 is loosely fitted in the groove of the switching ring 9, and the switching lever 70
The return springs 16 and 17 are biased to the right end 70d of the. Arms 70a and 70b are provided on the side surface between the pin 1c and the tip portion 70c. Arm 70a
Engages with the plunger of the solenoid 71 and the arm 70
b is engaged with the plunger of the solenoid 72. When the solenoid 71 conducts, the switching lever 70 rotates counterclockwise via the arm 70a. The switching ring 9 is moved downward by being pressed by the distal end portion 70c, and the claw portion 9a and the driving claw 8a are engaged to switch to the forward state. Solenoid 72
Is conducted, the switching lever 70 rotates clockwise via the arm 70a, and switches to the reverse state this time. Cam 21a
When the detection lever 62 rotates counterclockwise, the switch 31 is turned on. When the switch 31 is turned on and off, the control circuit of the solenoids 71 and 72 turns the switch 31 on and off.
This is performed by a combination of the OFF switching and the time constant circuit, and the document table (load) performs back, forward, and stop as shown in FIG.

In this embodiment, the adjustment of the assembly can be simplified because the lever configuration can be simplified.

[0044]

As described above, according to the present invention, the original table is reciprocated by separating the cam of the original table and the detection lever, so that the reciprocating drive and the neutral state can be performed without using a spring clutch. The resulting reciprocating drive can be provided.

Further, when the pawls are provided on the first and second output gears, it is not necessary to provide a special torque limiter mechanism, so that the entire driving device can be further simplified.

[Brief description of the drawings]

FIG. 1 relates to a reciprocating drive device according to a first embodiment of the present invention;
FIG. 1A is a schematic sectional view of a copying machine to which the present invention is applied, FIG. 2B is a schematic sectional view of a copying machine incorporating the reciprocating drive, and FIG. It is a top view of a stand.

FIG. 2 is an explanatory diagram of an operation of the copying machine.

FIG. 3 is a plan view of a main part of the reciprocating drive device.

FIG. 4 is a sectional view taken along line XX ′ of FIG. 3;

FIG. 5 is a plan view of a main part of the reciprocating drive device.

FIG. 6 is a sectional view taken along line YY ′ of FIG. 5;

7A is a diagram showing a gear and a switching ring of the reciprocating drive device, and FIG. 7B is a perspective view of a gear and a switching ring of the device.

8A is a sequence diagram of the device, and FIG. 8B is a block diagram of the device.

FIG. 9 is a schematic sectional view of a main part of a reciprocating drive device according to a second embodiment of the present invention.

FIG. 10 is a schematic sectional view of a main part of the apparatus.

FIG. 11 is an explanatory diagram of an operation of a claw lever of the device.

FIG. 12A is a sequence diagram of the device, and FIG. 12B is a block diagram of the device.

FIG. 13 is a plan view of a main part of a reciprocating drive device according to a third embodiment of the present invention.

FIG. 14 is a sectional view taken along line ZZ ′ of FIG. 13;

15A is a sequence diagram of the device, and FIG. 15B is a block diagram of the device.

[Explanation of symbols]

 G1 First gear train G2 Second gear train 9 Switching ring 22 Pinion gear 51 Document table C Switching mechanism 62 Detection lever 21a, 21b Cam 19 Solenoid 32 Control board (control circuit) 8 Gear (first output gear) 8a Driving claw 10 Gear (second output gear) 10a Driving claw

Claims (2)

(57) [Claims] 1. A reciprocating drive for a copying machine of a platen moving type, comprising: a first gear train for rotating a first output gear in a forward direction; and a second gear train for rotating a second output gear in a reverse direction. A second gear train, a switching ring driven by engaging the first output gear or the second output gear, a pinion gear engaged with the switching ring to reciprocate the document table, A switching mechanism for engaging and disengaging the first output gear or the second output gear and the switching ring; a detection lever for detecting a position of the document table; and the document table for contacting and separating with the detection lever And a control circuit for operating the solenoid in accordance with the contact and separation of the detection lever. 2. The reciprocating device according to claim 1, wherein the first output gear is provided with a driving claw that engages with the switching ring, and the second output gear is also provided with a driving claw that engages with the switching ring. Drive.