JP2539243B2 - Drive force transmission mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Overview] A drive force transmission mechanism that enables distribution of drive force transmission from a common drive source to a plurality of driven parts is provided. Constraints and wear,
In order to ensure reliable power transmission without the risk of damage, in a drive device that transmits the rotation of a drive source to a plurality of driven parts, a fixed shaft is provided on each of the driven parts. The transmission member driven by the drive source and rotatably supported by the fixed shaft, one or more transmitted members rotatably supported by the transmission member, and rotation of the fixed shaft are blocked. Electromagnetic clutches each of which is fitted so as to form a magnetic flux passing through the transmission member and the transmission target member during operation and attracts each other to integrate them,
By selectively turning on and off the electromagnetic clutch of each driven portion, power transmission from the drive source to the transmitted member of each driven portion can be distributed.

[Industrial applications]

The present invention relates to a drive force transmission mechanism that enables distribution of drive force transmission from a drive source in a chest to a plurality of driven parts.

[Conventional technology]

An example of this type of conventional driving force transmission mechanism is shown in FIG. In this example, the driving force of one driving gear is transmitted to two driven gears. In the figure, 1 is a driving gear, 2 ₁ and 2 ₂ are driven gears, and 3 ₁ and 3 ₂ are respective driven gears. This is a solenoid mechanism provided in the transmission system to 2 ₁ and 2 ₂ . Solenoid mechanism 3 ₁ is provided with a solenoid 4 ₁ and swingable pawl 5 ₁ and recovery spring _61, solenoid mechanism 3 _2, solenoid 4 ₂ and pivotable pawl
It has 5 ₂ and a recovery spring 6 ₂ . According to this mechanism, the direction of the arrow driven gear rotation (clockwise) 2 ₁ of the drive gear 1, 2 ₂ can be selectively transferred as follows will be described in detail.

The driving force of the driving gear 1 to turn on only the solenoid 4 ₁ solenoid 4 ₂ off when transmitted to the driven gear 2 _1. When the drive gear 1 is rotated in the direction of the arrow in this state,
This rotation is transmitted to the gear 11 via the gears 7, 8, 9 and 10. Meanwhile, the spring clutch is provided between the gear 14 and the gear 11 spring clutch 13 is provided, which meshes with the driven gear 2 ₂ between the gear 12 and the gear 7 which meshes with the driven gear 2 ₁
15 are provided. Also, the solenoid mechanisms 3 ₁ , 3 ₂
As shown in FIG. 4 for the solenoid mechanism 3 ₁ , the pawls 5 ₁ and 5 ₂ lock the teeth 16 and 17 of the spring clutches 13 and 15 when the solenoid is off, and release the lock when the solenoid is on. Has become. Therefore, as described above, the solenoid
4 in a state _{where 2} solenoid 4 ₁ off is turned on, the spring clutch 15 is only spring clutch 13 without transmitting the driving force to transmit the driving force driven gear 2 ₁ is rotated. To rotate the driven gear 2 _2, it is sufficient to rotate the driving gear 1 in the direction of an arrow off the solenoid 4 ₁ in the on position the solenoid 4 _2.

[Problems to be Solved by the Invention]

The conventional driving force transmission mechanism having such a structure and operation has the following various drawbacks.

(1) Since it is a system that transmits the driving force intermittently,
The number of components increases and the space required increases. Further, the structure is complicated because the clutch mechanism is required for the number of driven gears.

(2) There is a restriction that the drive gear always allows rotation in only one direction.

(3) Since the clutch is a mechanical one such as the illustrated spring clutch, there is a risk of wear due to sliding and time variation of engagement timing between the pawl and the clutch, and damage.

The present invention provides a driving force transmission mechanism having a simple structure and capable of surely transmitting power without the restriction of the rotational direction of drive, the risk of wear and damage.

[Means for solving the problem]

FIG. 1 is a diagram for explaining the principle of the present invention. FIG. 1 (a) is a perspective view showing the structure of a driving force transmission mechanism, and FIG. 1 (b) is an exploded perspective view of the main part of FIG. 1 (a). 1 (c) is a sectional view of the same.

In FIG. 1 (a), 101 is a drive source driven by a step motor or the like, and (a) and (b) are driven parts that receive the transmission of the driving force from the drive source 101. An electromagnetic clutch 102 having the same structure is provided in each of (a) and (b).

As shown in FIGS. 1B and 1C, the electromagnetic clutch 102 includes a fixed shaft 103, a transmission member 104, and a transmitted member 105.
And an electromagnet mechanism 106. The fixed shaft 103 is fixed so as not to rotate. The transmission member 104 is rotatably supported by the fixed shaft 103, and the transmitted member 105 is rotatably supported by the transmission member 104. The electromagnet mechanism 106 is fitted to the fixed shaft 103 so as to prevent rotation, and forms a magnetic path that passes through the transmission member 104 and the transmitted member 105 when operating by receiving power to the coil 106a. They play the role of attracting each other and integrating them.

Note that this figure shows an example of gear drive, and the drive source 101, the transmission member 104, and the transmitted member 105 are gears. The transmission member 104 of the driven portion (a) is driven by the driving source 101, and the transmission member 104 of the driven portion (b) is driven by the driving source 101 by the transmission member 104 of the driven portion (a) and the gears 107, 108. ,Ten
Driven through 9.

[Work]

When transmitting the driving force to the transmitted member 105 of the driven portion (a), only the electromagnetic clutch 102 of the driven portion (a) is operated (the coil 106a is energized). As a result, the coil 106a
As a result, a magnetic flux shown by an arrow in FIG. 1 (c) is formed, and the transmitting member 104 and the transmitted member 105 are attracted to each other and integrated. Therefore, when the drive source 101 is normally or reversely rotated in this state, this rotation is transmitted to the transmitted member 105.
In this case, since the electromagnetic clutch 102 of the driven portion (b) is not operating, the driving force is not transmitted to the transmitted member 105 of the electromagnetic clutch 102.

When transmitting the driving force to the transmitted member 105 of the driven portion (b), only the electromagnetic clutch 102 of the driven portion (b) needs to be operated.

In addition, 110 and 111 are driven gears for driving force transmission described as a reference, the driven gear 110 is driven by the transmitted member 105 of the driven portion (a), and the driven gear 111 is the driven portion (b).
It is driven by the member 105 to be transmitted.

In the above description, the transmitted member 105 of the electromagnetic clutch 102 is 1
Although the example of one piece has been described, a plurality of transmitted members 105 may be provided. In this case, each driven part (a),
The driving force is transmitted from (b) to the plurality of driven gears.

〔Example〕

 An embodiment of the present invention will be described below with reference to FIG.

FIG. 2 is a side view showing an outline of the structure of an electrophotographic printing apparatus to which the present invention is applied. In the figure, 21 ₁ and 21 ₂ are pick rollers 22 ₁
Cut sheet feeder with pick roller 22 ₂ and 2
3 is a printing unit, 24 is a discharge roller, and 25 is a step motor.

The pick rollers 22 ₁ and 22 ₂ are selectively driven by a step motor 25 at a predetermined time through a gear system shown in the drawings (details will be described later). In the middle of the gear system, electromagnetic clutches 102 ₁ and 102 2 are provided.
₂ (both are similar to the electromagnetic clutch 102 described above, and are suffixed to clearly distinguish the installation locations). The electromagnet mechanism is not shown for convenience.

The printing unit 23 includes a drum-shaped photoconductor 26, and a pre-charger, an exposure device, a developing device, a transfer device, a static eliminator, and a cleaner that are arranged around the photoconductor. Reference numeral 27 denotes a developing device and 28 transfer device, and other arrangement members are not shown.

When performing printing using the paper 100 stored in the cut sheet feeder 21 ₁ , the electromagnetic clutch 102 ₁ is turned on and the electromagnetic clutch 102 ₂ is turned off.
Rotate clockwise as indicated by the dotted arrow. This rotation is transmitted to the electromagnetic clutch 102 ₁ drive source 101 via the gears G ₁ , G ₂ , G ₃ , G ₄ , G ₅ , G ₆ , G ₇ , G ₈ , G ₉ . Thus, the transmission member 104 rotates, the pick roller 22 _1, the sheet feeding is started transmitted member 105 is driven through a driven gear 110 and the gear 29, 30 rotates in the clockwise direction by the rotation .
The rotation of the transmission member 104 in this case is transmitted to the transmission member 104 of the electromagnetic clutch 102 ₂ via the gears 107, 108, 109, but since the electromagnetic clutch 102 ₂ is off, the transmitted member 105
Does not rotate and the pick roller 22 ₂ does not feed the paper. A feed roller in which the leading edge of the fed sheet is coaxial with the drive source 101 (not shown because it is coaxial with the drive source 101)
When the signal reaches, the electromagnetic clutch 102 ₁ is turned off by the detection signal of the sensor 31 ₁ , the step motor 25 starts rotating in the counterclockwise direction indicated by the solid arrow line, and the sheet is paired with the feed roller and the feed roller. Then, it is continuously conveyed by the pinch roller which acts as described above, and enters the transfer position between the photoconductor 26 and the transfer device 28 of the printing unit 23. On the other hand, the photoconductor 26 is driven by a drive system (not shown) including a one-way clutch by the step motor 25 to start rotating counterclockwise, and the surface of the photoconductor 26 is subjected to known pre-charging, latent image formation,
A toner image is formed through the development process, and the toner image is
It is transferred by the transfer device 28 onto the sheet that has entered the transfer position as described above. The transfer-completed paper is sent to the fixing device 32 and fixed there, and is driven by the gear G _{8 through the} gears G _{10 to} G ₁₄ , the swing gear mechanism 33, and the first and second transmission systems 34 and 35. Then, the sheet is discharged onto the stacker 36 or the stacker 37 by the discharge roller 24 which rotates in the paper discharge direction (counterclockwise direction in the figure) at all times (regardless of the forward / reverse rotation of the step motor 25). The swing gear mechanism 33 described above includes a lever 38 rotatably supported by the shaft of the gear G ₁₄ , and first and second levers 38 supported by respective ends of the lever 38 and meshing with the gear G ₁₄ . When the gear G ₁₄ is rotated counterclockwise, the lever 38 rotates counterclockwise so that the first gear 39 and the first transmission system 34 are engaged with each other to cause the discharge roller 24 to rotate. Rotate counterclockwise to turn gear G
_When the lever ₁₄ is rotated in the clockwise direction, the lever 38 is rotated in the clockwise direction to engage the second gear 40 and the second transmission system 35 to rotate the discharge roller 24 in the counterclockwise direction. By doing so, the next sheet can be fed out before the sheet is completely discharged by the discharge roller 24, and the processing speed can be improved. Specifically, the sensor
31 ₂ is to switch the rotational direction of the step motor 25 when detecting the trailing edge of the sheet. The first transmission system 34
Is composed of gears 41 and 42 and a gear 43 coaxial with the discharge roller 24, and the second transmission system 35 is composed of gear 42 and gear 43. Further, the stacker 36 is of a type that is stacked with the printing surface underneath, and the stacker 37 is of a type that stacks the output paper with the printing surface facing up by reversing the discharged sheets. Stacker 37
Is attached in place of the stacker 36 at the request of the user.

In the above description, the example of using the storage paper in the cut sheet feeder 22 ₁ has been described.
22 When using _{2 2} sheets of storage paper, the electromagnetic clutch 102 ₁
Is turned off and the electromagnetic clutch 102 ₂ is turned on. And
The electromagnetic clutch 102 ₂ turns off when the step motor 25 reverses.

〔The invention's effect〕

As described above, according to the present invention, the following various excellent effects are exhibited.

(1) The structure of the present invention shown in FIG. 1 has fewer constituent parts and is simpler than that shown in FIGS. 4 and 5, and the size of the apparatus can be reduced.

(2) There is no restriction on the driving rotation direction.

(3) Reliability is improved because there are few mechanical actuating parts and there is very little risk of wear and breakage as in conventional mechanical clutches.

[Brief description of drawings]

FIGS. 1 (a), (b) and (c) are explanatory views of the principle of the present invention, FIG. 2 is a side view showing an outline of the structure of an electrophotographic printing apparatus according to an embodiment of the present invention, and FIG. 4 is a perspective view showing the driving force transmission mechanism of FIG. 4, FIG. 4 is an explanatory view of the action of the spring clutch of FIG. 3, in which 101 is a drive source, 102, 102 ₁ and 102 ₂ are electromagnetic clutches, 103 is a fixed shaft, and 104 is A transmission member, 105 is a transmitted member, 106 is an electromagnet mechanism, 107, 108, 109 are gears, 110, 111 are driven gears, and (a) and (b) are driven parts.

Claims (1)

(57) [Claims] 1. A drive device for transmitting rotation of a drive source (101) to a plurality of driven parts ((a), (b)), wherein each driven part ((a), (b)) A fixed shaft (103) and the fixed shaft (103) driven by the drive source (101)
The transmission member (104) rotatably supported by the transmission member, the one or more transmission target members (105) rotatably supported by the transmission member (104), and the rotation of the fixed shaft (103). The transmission member (104) and the transmitted member (10
An electromagnetic clutch (10) comprising an electromagnet mechanism (106) that forms a magnetic flux passing through (5) and attracts them to integrate them.
2) are provided respectively, and the electromagnetic clutch (10) of each driven part ((a), (b)) is provided.
By selectively turning on and off 2), the power transmission from the drive source (101) to the driven members (105) of the driven parts ((a), (b)) can be distributed. A drive force transmission mechanism characterized in that