JPH0578704B2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a forward/reverse rotation control mechanism, more specifically,
The present invention relates to a forward/reverse rotation control mechanism for transmitting the rotation of a rotationally driven input rotating element to an output rotating element and selectively rotating the output rotating element in a predetermined direction or in a direction opposite to the predetermined direction.

<Prior Art> In recent years, among electrostatic copying devices, a double-sided copying device capable of copying on both sides of copy paper has been proposed and put into practical use. In such a double-sided copying apparatus, after copying is performed on one side of the copy paper conveyed through the copy paper conveyance path, the copy paper is conveyed to the upstream side of the copy paper conveyance path and then conveyed again through the copy paper conveyance path. Therefore, a conveyance means is provided for conveying the copy paper in a predetermined direction and then conveying the copy paper toward the upstream side of the copy paper conveyance path in a direction opposite to the predetermined direction.
This conveying means is generally composed of a pair of conveying rollers capable of forward rotation and reverse rotation, and a forward rotation/reversal control mechanism is attached to the conveyance roller pair.

However, the conventional forward/reverse rotation control mechanism has problems such as a complicated configuration and high cost, and there are points that need to be improved before it can be applied to an electrostatic copying apparatus or the like.

<Object of the Invention> The present invention has been made in view of the above facts, and its object is to selectively rotate an output rotating element in a predetermined direction or in a direction opposite to the predetermined direction with a relatively simple configuration. It is an object of the present invention to provide a small, inexpensive, and improved forward/reverse rotation control mechanism that can perform the following functions.

<Summary of the Invention> The present inventors have proposed that when selectively rotating an output rotating element in a predetermined direction or in a direction opposite to the predetermined direction, two spring clutches are used to rotate the output rotary element with a single control means. It has been found that even if the spring clutch is controlled, there is no problem because there is some time (time required for the coil spring to contract) before the spring clutch itself becomes connected.
In addition, when controlling two spring clutches individually, there is a risk that the functions may be damaged if both spring clutches become connected due to malfunction, but in the case described above, such problems can be avoided. Avoided.

According to the present invention, the first transmission train includes an input rotational element to which a rotational driving force is transmitted, a first transmission train, a second transmission train, an output rotational element, and a forward/reverse rotation control means, a power transmission rotation element that is drivingly connected to the rotation element so as to rotate in a predetermined direction and has an output hub section; and a drive power transmission element that has an input hub section for transmitting driving force in the predetermined direction to the output rotation element. and is fitted over the outer periphery of both the output hub section and the input hub section, and extends from the input side end located on the output hub section side to the output side end located on the input hub section side. a transmission coil spring previously wound in a direction opposite to the predetermined direction, the second transmission train being drivingly coupled to the input rotating element to rotate in a direction opposite to the predetermined direction;
and a driving force transmission element having an input hub section for transmitting a driving force in a direction opposite to the predetermined direction to the output rotation element, the output hub section and the input. It is fitted over both outer circumferential parts of the hub part and is wound in the predetermined direction from the input side end located on the output hub part side to the output side end located on the input hub part side. a transmission coil spring, the outer diameter of the outer circumference of the input hub section is smaller than the outer diameter of the outer circumference of the output hub section, and the inner diameter of the transmission coil spring is smaller than the outer diameter of the outer circumference of the output hub section. The forward rotation/reverse rotation control means is formed to be larger than the outer diameter of the outer peripheral portion and smaller than the outer diameter of the outer peripheral portion of the output hub portion, and the forward/reverse rotation control means is rotatably connected to the transmission coil spring of the first transmission train. A first control rotary element fitted therein, a second control rotation element rotatably fitted on the transmission coil spring of the second transmission train, and an actuating means to rotate the first and second control rotation elements. a non-acting position in which no action is applied to the control rotational element; and the first and second
a rotation control means having an actuation control member selectively positioned in an operating position acting on a control rotational element of the first transmission train, the input side end of the transmission coil spring in the first transmission train being in a working position acting on a control rotation element of the first transmission train; connected to a rotating element,
The input side end of the transmission coil spring in the second transmission train is connected to the transmission rotation element, and the output side end is connected to the second control rotation element, and the actuation control member is connected to the locking portion. and a pressing portion, the first control rotation element is formed with a locked portion, the second control rotation element is constituted by a sleeve member, and the operation control member is In the non-operating position, the locking portion is disengaged from the locked portion of the first control rotational element, the pressing portion is separated from the circumferential surface of the sleeve member, and the actuation control The locking portion is configured to be locked to the locked portion and the pressing portion is pressed against the circumferential surface of the sleeve member when the member is in the action position. A reversal control mechanism is provided.

<Preferred Specific Example of the Invention> A specific example of the forward/reverse rotation control mechanism constructed according to the present invention will be described below with reference to the accompanying drawings.

First, a first specific example of the forward/reverse rotation control mechanism will be described with reference to FIGS. 1 to 3.
In the figures and FIG. 2, the illustrated forward/reverse rotation control mechanism 2 includes an input rotating element 4, a first transmission train 6, and a second transmission train 8. A support substrate 10, such as a vertical rear substrate in an electrostatographic apparatus, has a short axis 12.
is fixed by a bolt 13, and the input rotating element 4 is rotatably mounted on the short shaft 12. The illustrated input rotating element 4 is composed of a connecting member having a sprocket portion 14 and a gear portion 16, and the sprocket portion 14 is connected to a transmission member 18 such as a chain.
It is drivingly connected to a driving source (not shown) via.

The gear section 16 of the input rotating element 4 is drivingly coupled to the first transmission train 6 and the second transmission train 8 via a gear train 20 . A shaft member 22 is fixed to the support substrate 10 with bolts 24, and a double gear 29 having a gear portion 26 and a gear portion 28 is rotatably mounted on the shaft member 22.
Support members 30 and 32 are also mounted. A small gear 36 is connected to the tip of the support member 30 via a short shaft 34.
is rotatably mounted thereon, and a small gear 40 is also rotatably mounted on the tip of the support member 32 via the short shaft 38. In such a gear train 20,
The pinion 36 meshes with the gear portion 16 of the input rotating element 4 and also meshes with the gear portion 28 of the double gear 29, and the gear portion 26 of the double gear 29 meshes with the pinion 4.
It is engaged with 0.

Mainly referring to FIG. 3 together with FIG. 2, the illustrated first transmission train 6 includes a gear 42 constituting a transmission rotation element and a transmission member 4 constituting a driving force transmission element.
4 and a transmission coil spring 46 (FIG. 3).

Further, the second transmission train 8 includes a gear 48 that constitutes a transmission rotation element, a transmission member 50 that constitutes a driving force transmission element, and a transmission coil spring 52 (FIG. 3). In the first transmission train 6, the gear 42 meshes with the gear portion 28 of the double gear 29, and in the second transmission train 8, the gear 48 meshes with the small gear 40. Therefore, when the input rotary element 4 is rotationally driven in the direction shown by arrow 54 in FIG. 1 by the action of a drive source (not shown), the pinion 36 is rotated in the direction shown by arrow 56, and further The double gear 29 is rotated in the direction indicated by the arrow 58, thereby causing the gear 4 of the first transmission train 6 to rotate.
2 is rotated in the direction shown by the arrow 60 (see also FIG. 3), and the gear 48 of the second transmission train 8 is rotated in the direction shown by the arrow 64 (see also FIG. 3) via the pinion 40, which is rotated in the direction shown by the arrow 62. (See also Figure 3).

Next, the detailed configurations of the second transmission train 6 and the second transmission train 8 will be described mainly with reference to FIG. 3. A transport roller 6 is provided between the support substrate 10 and another support substrate (not shown) such as a vertical front substrate.
A shaft member 66 (constituting an output rotating element) such as a rotating shaft to which a rotary shaft 5 is attached is rotatably supported. A small diameter portion 66a is provided at one end of the shaft member 66 protruding outward from the support substrate 10, and the gear 42 of the first transmission train 6 is rotatably mounted on the inner end of the small diameter portion 66a. ing. gear 42
A cylindrical output hub portion 68 is integrally formed on the outer surface of the shaft member 66, and the output hub portion 68 extends outward in the axial direction of the shaft member 66. A transmission member 4 is provided on the outside of the gear 42.
4 is disposed, and the transmission member 44 is fixed to the small diameter portion 66a of the shaft member 66 by a mounting screw 70. A cylindrical input hub portion 72 is integrally formed on the inner surface of the transmission member 44, and the input hub portion 72 extends inward in the axial direction of the shaft member 66 toward the output hub portion 68 of the gear 42. The input hub portion 72 provided on the transmission member 44 has an outer diameter that is substantially equal to the outer diameter of the output hub portion 68 provided on the outer surface of the gear 42 .

A transmission coil spring 46 is fitted into the output hub portion 68 of the gear 42 and the input hub portion 72 of the transmission member 44 so as to straddle them both. The transmission coil spring 46 is wound clockwise from the input side end to the output side end when viewed from the lower right side in FIG. It is wound in the direction of contraction). The inner diameter of the transmission coil spring 46 is the same as that of the output hub portion 68 of the gear 42 and the input hub portion 72 of the transmission member 44.
It is slightly smaller than the outer diameter of. Further, a gear 48 of the second transmission train 8 is rotatably mounted on the tip of the small diameter portion 66a of the shaft member 66, and a locking member 74 is locked on the outside of the gear 48.
A cylindrical output hub portion 76 is integrally formed on the inner surface of the gear 48, and the output hub portion 76 extends inward in the axial direction of the shaft member 66. A transmission member 50 is disposed between this gear 48 and the transmission member 44,
The transmission member 50 is attached to the shaft member 66 by a mounting screw 78.
It is fixed to the small diameter portion 66a of. A circular input hub portion 80 is integrally formed on the outer surface of the transmission member 50, and the input hub portion 80 extends outward in the axial direction of the shaft member 66 toward the output hub portion 76 of the gear 48. The input hub portion 80 provided on the transmission member 50 has an outer diameter somewhat smaller than the outer diameter of the output hub portion 76 provided on the inner surface of the gear 48 . A transmission coil spring 52 is fitted into the output hub portion 76 of the gear 48 and the input hub portion 80 of the transmission member 50 so as to straddle them both. The transmission coil spring 52 has a right-handed winding from the input end to the output end when viewed from the lower right in FIG. 3 (that is, the transmission member 50
When the gear 48 is rotated in the direction indicated by the arrow 64, the gear 48 is wound in a direction in which it contracts. The inner diameter of this transmission coil spring 52 is the same as that of the gear 48.
It is slightly smaller than the outer diameter of the output hub portion 76 of the transmission member 50, and is slightly larger than the outer diameter of the input hub portion 80 of the transmission member 50.

In connection with the first transmission train 6 and the second transmission train 8 described above, a forward/reverse rotation control means 82 is further provided. The illustrated forward/reverse rotation control means 82 is as follows:
It has a ratchet wheel 84 constituting a first control rotation element, a sleeve member 86 constituting a second control rotation element, and rotation control means 88. A pawl 90 is integrally formed on the peripheral side of the ratchet wheel 84. nail 90
constitutes a locked portion to which a locking portion 100 of an operation control member 96, which will be described later, is locked. In the specific example, the ratchet wheel 84 is rotatably fitted onto the transmission coil spring 46, and the input side end 46a of the transmission coil spring 46 is inserted into a notch 92 formed at the inner end of the ratchet wheel 84.
are connected. Further, the sleeve member 86 is rotatably fitted onto the transmission coil spring 52, and has a notch 94 formed at the inner end of the sleeve member 86.
An output side end 52b of the transmission coil spring 52 is connected to the transmission coil spring 52, and an input side end 52a thereof is connected to a hole 95 formed in the gear 48. Rotation control means 88
has a substantially T-shaped actuation control member 96 that is swingably mounted, and actuation means 98 that selectively positions the actuation control member 96 in an active position and a non-active position. The operation control member 96 is disposed above the middle of the ratchet wheel 84 and the sleeve member 86 (see also FIG. 2), and its tip 96a extends in the axial direction of the shaft member 66. A locking portion 100 that hangs downward is provided at one end (inner end) of this tip portion 96a, and a friction member 102 constituting a pressing portion is provided at the lower surface of the other end (lower surface of the outer end). ing. The actuating means 98 shown is an electromagnetic solenoid 104.
The output end 104a is connected to the pin member 1.
It is rotatably connected to the rear end portion of the operation control member 96 via 06.

In the forward/reverse rotation control means 82 having such a configuration, when the electromagnetic solenoid 104 is energized, the operation control member 96 is rotated counterclockwise in FIG. 1
00 is engaged with the pawl 90 of the ratchet wheel 84, and the friction member 102 is pressed against the circumferential surface of the sleeve member 86, thus becoming activated. On the other hand, when the electromagnetic solenoid 104 is deenergized, the electromagnetic solenoid 10
4 and the rear end of the operation control member 96 (FIG. 1), the operation control member 96 is rotated clockwise in FIG. (position shown in Figures and Figure 2)
As a result, the locking portion 100 is released from the claw 90 of the ratchet wheel 84 and the friction member 10
2 is spaced from the circumferential side of the sleeve member 86 and is thus inactive.

Next, the effects of the forward/reverse rotation control mechanism 2 having the above-described configuration will be explained with reference mainly to FIG. 3.

When the electromagnetic solenoid 104 is deenergized, the actuation control member 96 is held in the non-operating position by the action of the spring member 108 (FIG. 1).
In such a state, the locking portion 100 of the actuation control member 96 does not engage with the pawl 90 of the ratchet wheel 84, and the frictional engaging portion 102 does not engage with the pawl 90 of the ratchet wheel 84.
The ratchet wheel 84 and the sleeve member 86 can freely rotate without acting on the peripheral surface of the sleeve member 86.
Therefore, as can be easily understood, the rotation of the gear 42 of the first transmission train 6 in the direction indicated by the arrow 60 causes the transmission coil spring 46 to contract, causing the rotation of the gear 42 of the first transmission train 6. Power is transmitted from the output hub section 68 to the input hub section 72 of the transmission member 44 via the transmission coil spring 46. Thus, the rotational force from the input rotating element 4 is transmitted to the shaft member 66 via the first transmission member 6, and this shaft member 66 is connected to the gear 4.
It is rotated in the same predetermined direction (clockwise in FIG. 1) as the direction of rotation shown by arrow 60 in FIG. In addition, in this state, the gear 48 of the second transmission train 8
However, since the sleeve member 86 is rotatable, the transmission coil spring 52 and the sleeve member 86 rotate together with the gear 48, and the transmission coil spring 52 is contracted. Therefore, the rotational force of the gear 48 is not transmitted to the transmission member 50 via the transmission coil spring 52.

When the electromagnetic solenoid 104 is energized from the deenergized state, the actuation control member 96 is activated by the spring member 108.
(FIG. 1) is swiveled counterclockwise in FIG. 1 against action. In this way, the operation control member 9
6 is held in the operating position, and its locking portion 100
is locked by the pawl 90 of the ratchet wheel 84 to prevent rotation of the ratchet wheel 84, and at the same time, the friction member 102 is pressed against the circumferential surface of the sleeve member 86, and a load is applied to the sleeve member 86 (in operation state). become). Thus, the transmission coil spring 52 is rotated by the gear 48 of the second transmission train 8 which is rotating in the direction shown by the arrow 64.
The input side end 52a connected to the hole 95 of
Twisting occurs between the output side end 52b connected to the notch 95 of. As a result, the transmission coil spring 5
2 is contracted, and the rotational force of the gear 48 is transmitted from its output hub portion 76 to the input hub portion 80 of the transmission member 50 via the transmission coil spring 52. (rotated along with the movement). Thus, the rotational force from the input rotating element 4 is transmitted to the shaft member 66 via the second transmission train 8.
The shaft member 66 is transmitted to the arrow 6 of the gear 48.
It is rotated in a direction opposite to the above-mentioned predetermined direction (counterclockwise in FIG. 1), which is the same as the rotation direction indicated by 4.
Note that at this time, the gear 42 of the first transmission train 6
is also rotating in the direction shown by the arrow 60, but the ratchet wheel 8
Since the pawl 90 of No. 4 engages with the locking portion 100 and its rotation is prevented, the transmission coil spring 46 is not contracted, and therefore the rotational force of the gear 42 is transmitted through the transmission coil spring 46. It is not transmitted to the transmission member 44.

In the specific example, as can be understood from FIG. 2, when the electromagnetic solenoid 104 is energized, the locking portion 100 engages the pawl of the ratchet wheel 84 immediately before the friction member 102 acts on the circumferential surface of the sleeve member 86. Therefore, after the locking portion 100 is locked with the pawl 90 of the ratchet wheel 84, the friction member 102
is pressed against the circumferential surface of the sleeve member 86, there is a state in which the transmission coil spring 46 of the first transmission train 6 and the transmission coil spring 52 of the second transmission train 8 are not contracted, and therefore, at this moment In this case, the driving force is not transmitted to the rotating shaft 66 via the first transmission train 6 and the second transmission train 8.

When the electromagnetic solenoid 104 is deenergized from the energized state, the actuation control member 96 is activated by the spring member 108.
It is rotated clockwise in FIG. 1 by the action of (FIG. 1). Thus, the actuation control member 96
is held in the non-operating position, and its locking portion 100
is disengaged from the pawl 90 of the ratchet wheel 84, and its friction member 102 is separated from the circumferential surface of the sleeve member 86, and thus the shaft member 66 is connected to the first transmission train, as is easily understood from the above description. 6 in the predetermined direction.

In a specific example, when the electromagnetic solenoid 104 is deenergized, the first The transmission coil spring 46 of the transmission train 6 and the second transmission train 8
There is a state in which the transmission coil spring 52 is not contracted, so that no driving force is transmitted to the shaft member 66 via the first transmission train 6 and the second transmission train 8 even at this moment.

As described above, in the forward/reverse rotation control mechanism 2 of the first specific example, the shaft member 66 can be selectively and reliably rotated in a predetermined direction or in a direction opposite to the predetermined direction.

Next, a second specific example of the forward/reverse rotation control mechanism will be described with reference to FIGS. 4 to 7. Fifth
In the figures and FIG. 6, the illustrated forward/reverse rotation control mechanism 202 includes an input rotation element 204, a first transmission train 206, and a second drive train 208.
A short shaft 212 is fixed to the support substrate 210 with a bolt 213, and the input rotating element 204 is rotatably mounted on the short shaft 212. The input rotating element 204 includes a sprocket portion 214 and a gear portion 216.
The sprocket portion 214 is connected to the transmission member 218.
It is drivingly connected to a driving source (not shown) via.

The illustrated first transmission train 206 includes a gear 220 that constitutes a transmission rotation element, a transmission member 222 that constitutes a driving force transmission element, and a transmission coil spring 224.
(See Figure 6). Further, the second transmission train 208 includes a gear 22 constituting a transmission rotation element.
6. Transmission member 228 constituting the driving force transmission element;
and a transmission coil spring 230 (FIG. 7). And the gear 220 of the first transmission train 206
is meshed with the gear 226 of the second transmission train 208, and the gear 226 is engaged with the gear part 2 of the input rotating element 204.
It is meshed with 16. Therefore, the gear portion 216 of the input rotating element 204 is driven by a drive source (not shown).
is rotated in the direction shown by arrow 232 in FIG. is rotated in the direction shown by arrow 236.

Next, referring mainly to FIGS. 5 to 7, the first transmission train 206 and the second transmission train 2
The configuration of 08 will be explained. First, with reference to FIGS. 5 and 6, a first shaft member 238 is rotatably supported on the support substrate 210, and the first transmission train 206 is attached to the first shaft member 238. There is.

The gear 220 is rotatably attached to the tip of the first shaft member 238. A cylindrical output hub portion 240 is formed on the inner surface of the gear 220, and the output hub portion 240 extends inward in the axial direction of the first shaft member 238. A transmission member 22 is located inside the gear 220.
2 is arranged, and the transmission member 222 is attached to the mounting screw 242.
is fixed to the first shaft member 238 by. A cylindrical input hub portion 244 is formed on the outer surface of the transmission member 222, and the input hub portion 244 is connected to the gear 222.
The first shaft member 23 toward the output hub section 240 of
8 in the axial direction. Output hub portion 240 of gear 220 and input hub portion 2 of transmission member 222
44, a transmission coil spring 224 is fitted over both of them. Output hub portion 240 of gear 220 and input hub portion 244 of transmission member 222
The relationship between the outer diameter of the transmission coil spring 224 and the inner diameter of the transmission coil spring 224 is the same as in the first specific example. The transmission coil spring 224 is left-handed from the input side end to the output side end when viewed from the right side in FIG.
When the gear 220 is rotated in the direction indicated by an arrow 236 relative to the gear 22, the winding is wound in a direction in which the gear 220 contracts. A transmission gear 246 is further disposed inside the transmission member 222, and the transmission gear 246 is fixed to the first shaft member 238 by a mounting screw 248. Further, with reference to FIGS. 5 and 7, a second shaft member 250 is rotatably supported between the support substrate 210 and the other support substrate (not shown), and one end of the second shaft member 250 supports the support substrate 210. It penetrates and protrudes further outward. In the second specific example, the second shaft member 250 constitutes an output rotation element, and is constituted by a rotation shaft to which a conveyance roller 252 is attached. A gear 226 of the second transmission train 208 is rotatably mounted on one end of the second shaft member 250. A cylindrical output hub portion 254 is formed on the inner surface of the gear 226, and the output hub portion 254 extends inward in the axial direction of the second shaft member 250. A transmission member 228 is disposed inside the gear 226, and the transmission member 228 is connected to the second transmission member by a mounting screw 256.
It is fixed to the shaft member 250 of. Transmission member 22
A cylindrical input hub portion 258 is formed on the outer surface of the second shaft member 250 , and the input hub portion 258 extends outward in the axial direction of the second shaft member 250 toward the output hub portion 254 of the gear 226 . Output hub portion 254 of gear 226
A transmission coil spring 230 is fitted over the input hub portion 258 of the transmission member 228 and the input hub portion 258 of the transmission member 228 . The transmission coil spring 230 is clockwise wound from the input side end to the output side end when viewed from the right side in FIG. direction). The relationship between the outer diameters of the output hub portion 254 of the gear 226 and the input hub portion 258 of the transmission member 228 and the inner diameter of the transmission member coil spring 230 is the same as in the first specific example. A transmission gear 260 is further provided inside the transmission member 228.
is provided, and the transmission gear 260 is fixed to the second shaft member 250 by a mounting screw 262. As shown in FIGS. 4 and 5, this transmission gear 260 is connected to a first shaft via an intermediate gear 268 rotatably mounted on a short shaft 266 fixed to the support substrate 210 by a bolt 264. Member 238 is drivingly connected to transmission gear 246 .

Referring to FIGS. 4 and 5, a forward/reverse rotation control means 270 is further provided in relation to the first transmission train 206 and the second transmission train 208.
The illustrated forward/reverse rotation control means 270 includes a ratchet wheel 272 constituting a first control rotation element, a sleeve member 274 constituting a second control rotation element, and a rotation control means 276. A pawl 278 is formed on the circumferential side of the ratchet wheel 272 . The pawl 278 constitutes a locked portion to which a locking portion 284 of an operation control member 280, which will be described later, is locked. In this second specific example, the ratchet wheel 272 is rotatably fitted into the transmission coil spring 224 of the first transmission train, and the ratchet wheel 272
An input side end 224a of the transmission coil spring 224 is connected to a notch 279 formed at the outer end of the transmission coil spring 224 (see also FIG. 6). Further, the sleeve member 274 is rotatably fitted onto the transmission coil spring 230 of the second transmission train 208, and the output side end 230b of the transmission coil spring 230 is inserted into a notch 281 formed at the inner end of the sleeve member 274. connected. In addition, the input side end 230a of this transmission coil spring 230 is connected to a hole 230a formed in the gear 226.
83. Illustrated rotation control means 27
6 is an elongated plate-shaped operation control member 280;
It has an electromagnetic solenoid 282 (constituting actuating means) that selectively positions the actuation control member 280 in an active position and a non-active position. Operation control member 28
The middle part of 0 is the output end 28 of the electromagnetic solenoid 282.
2a, a locking portion 284 that hangs downward is provided at one end, and a friction member 286 constituting a pressing portion is provided on the lower surface of the other end.

In the forward/reverse rotation control means 276 having such a configuration, when the electromagnetic solenoid 282 is energized, the operation control member 280 is moved downward in FIG.
84 is locked with the pawl 278 of the ratchet wheel 272, and the friction member 286 is pressed against the circumferential surface of the sleeve member 274 (becomes in an operative state), and on the other hand, when the electromagnetic solenoid 282 is deenergized, the friction member 286 (not shown) Due to the action of the spring member, the actuation control member 280 is moved upward in FIG.
84 is disengaged from the pawl 278 of the ratchet wheel 272, and the friction member 286 is separated from the circumferential side of the sleeve member 274 (becomes inactive).

Next, the effects of the forward/reverse rotation control mechanism 202 of the second specific example described above will be explained with reference mainly to FIGS. 4, 6, and 7.

When the electromagnetic solenoid 282 is deenergized, the operation control member 280 is held in the non-operating position by the action of a spring member (not shown). In this state, the locking portion 284 of the actuation control member 280 does not engage with the pawl 278 of the ratchet wheel 272, and the friction member 286 does not engage with the pawl 278 of the ratchet wheel 272.
4, the ratchet wheel 272 and the sleeve member 274 can freely rotate. Therefore, as is easily understood, the rotation of the gear 220 of the first transmission train 206 in the direction indicated by the arrow 236 causes the transmission coil spring 224 to contract, and the rotational force of the gear 220 is transferred to the transmission coil spring 224.
is transmitted to the transmission member 222 via. In this way, the rotational force from the input rotating element 204 is transmitted to the second shaft member 250 via the first transmission train 206, the transmission gear 246, the intermediate gear 268, and the transmission gear 260, and this second shaft member 250 is a gear. The same predetermined direction as the rotation direction of 220 (clockwise direction, which is the opposite direction to the direction indicated by arrow 234 in FIG. 4)
is rotated. In such a situation, the second
The gear 226 of the transmission train 208 is also rotating in the direction shown by the arrow 234, but since the sleeve member 274 is rotatable, the transmission coil spring 230 is not compressed, so the rotation of the gear 226 is Power is transmitted to the transmission member 22 via the transmission coil spring 230.
8 will not be transmitted.

When the electromagnetic solenoid 282 is energized from the deenergized state, the operation control member 280 is held in the operating position, and the locking portion 284 engages the pawl 2 of the ratchet wheel 272.
78 to prevent rotation of the ratchet wheel 272, and the friction member 286 is engaged with the sleeve member 27.
A load is applied to the sleeve member 274 by being pressed against the circumferential side of the sleeve member 274 . Thus, the sleeve member 274
Due to the load acting on the second transmission train 20
The transmission coil spring 230 is contracted by the rotation of the gear 226 of No. 8 in the direction shown by the arrow 234, and the transmission coil spring 230 is compressed.
26 is transmitted to the transmission member 228 via the transmission coil spring 230 (at this time, the sleeve member 274 is rotated in conjunction with the rotation of the gear 226). Thus, the rotational force from the input rotating element 204 is transmitted to the second shaft member 250 via the second transmission train 208, and the second shaft member 250 rotates in the same direction as the rotation direction indicated by the arrow 234 of the gear 226. It is rotated in the opposite direction (counterclockwise in FIG. 4). On the other hand, this second shaft member 2
The rotational force of 50 is the transmission gear 260, intermediate gear 26
8 and the first member 238 via the transmission gear 246
It is also transmitted to Incidentally, at this time, the gear 220 of the first transmission train 206 is also rotating in the direction shown by the arrow 236, but since the ratchet wheel 272 engages with the locking portion 284 and its rotation is prevented, The transmission coil spring 224 is not contracted, and therefore the rotational force of the gear 220 is not transmitted to the transmission member 222 via the transmission coil spring 224.

In this second specific example as well, as can be easily understood from FIG. Immediately before acting on the side surface, there is a state in which the transmission coil spring 224 of the first transmission train 206 and the transmission coil spring 230 of the second transmission train 208 are not contracted.

When the electromagnetic solenoid 282 is deenergized, the actuation control member 280 is held in the non-operating position by the action of a spring member (not shown), and the locking portion 284 of the actuation control member 280 is held in the non-operating position by the action of a spring member (not shown). As it is detached from the pawl 278, its friction member 286 is separated from the circumferential surface of the sleeve member 274, and the second shaft member 250 is thus separated from the first transmission train 206, as will be easily understood from the above description. It is rotated in the predetermined direction via the gear 246, intermediate gear 268, and transmission gear 260.

Also in this second specific example, when the electromagnetic solenoid 282 is deenergized, the locking portion 284 engages the pawl 278 of the ratchet wheel 272, as in the first specific example.
Immediately before leaving the first transmission train 20
6 transmission coil spring 224 and second transmission train 2
There is a state in which the transmission coil spring 230 of No. 08 is not contracted.

As described above, also in the forward/reverse rotation control mechanism 202 of the second specific example, the second shaft member 250 constituting the output rotation element can be selectively moved in a predetermined direction or in a direction opposite to the predetermined direction. It can be rotated reliably.

In addition, in the second specific example, the second shaft member 2
50 constitutes the output rotation element, but instead of this, the first shaft member 238 may constitute the output rotation element.

The forward/reverse rotation control mechanism of the first specific example or the second specific example described above is applied, for example, to the copy paper conveyance mechanism shown in FIG. 8.

In FIG. 8, which schematically shows the discharge section of the electrostatic copying device for double-sided copying, a drive roller 300 is disposed on the copy paper discharge side, and a driven roller 302 is in contact with the upper part of the drive roller 300. A driven roller 304 is in contact with the lower portion thereof. On the downstream side of the drive roller 300, a pair of transport rollers 306 and 30 are provided.
8 and a pair of discharge rollers 310 and 312 are provided. A swing guide member 314 is further disposed downstream of the drive roller 300, and a swing guide member 31
4 has its upper surface extending toward the pair of conveying rollers 306 and 308 when it is in the first position shown by the solid line in FIG. Extending toward a pair of ejection rollers 310 and 312. In the copy paper transport mechanism described above, the forward rotation/reverse rotation control mechanism 2 (or 20
2) is applied to the conveyance roller 308 (that is, the conveyance roller 65 in the first concrete example or the conveyance roller 252 in the second concrete example constitutes the conveyance roller 308).

In such a copy paper conveyance mechanism, when copying is performed on both sides of a copy paper, the swing guide member 31 is first moved.
4 is held in the first position, and the electromagnetic solenoid 104 (or 282) is deenergized. Therefore, the copy paper that is transported through the copy paper transport path and has a copy produced on one side by a known means (not shown) is guided by the upper guide portion 316a of the guide member 316, and is guided by the driving roller 300 and the driven roller 300. It is conveyed between rollers 302. The copy paper thus conveyed is then conveyed to a pair of conveying rollers 306 and 308 through a guide plate 318 and a swinging guide member 314 by the action of a driving roller 300 and a driven roller 302 that rotate in the direction shown by the arrow. be done.
In the transport roller pair 306 and 308, the electromagnetic solenoid 104 (or 282) is deenergized, so the transport roller 308 is rotated in the direction shown by the arrow 320, and therefore, the copy paper is transferred to the transport roller pair 306 and 308. 308, the copy paper is conveyed to a pair of curved guide plates 322 and 324 (constituting a stock section when changing the conveyance direction of the copy paper).

When most of the copy paper is positioned between the guide plate pair 322 and 324 (in other words, the trailing edge of the copy paper leaves the drive roller 300 and the driven roller 302), the electromagnetic solenoid 104 (or 2
82) is energized. In this way, the conveyance roller 3
08 is an arrow 32 opposite to the direction indicated by arrow 320
6, the copy paper is rotated in the direction shown in FIG.
0 and the driven roller 304. Then, the copy paper passes between the lower guide portion 316b of the guide member 316 and the guide plate 228 by the action of the drive roller 300 and the driven roller 304, which are rotated in the direction shown by the arrow, and is transferred upstream of the copy paper conveyance path. transported to the side.

When the copy paper with copies made on one side is conveyed to the upstream side of the copy paper conveyance path, the swing guide member 314 is then held at the second position (note that at this time, the electromagnetic solenoid 104 or 202 may be emasculated). In this way, the copy paper on which copies have been made on other sides (that is, the copy paper on which copies have been made on both sides) is moved to the swing guide member 3 by the action of the driving roller 300 and the driven roller 302.
14 through the upper surface of the discharge roller pair 310 and 31.
2, and is discharged to the outside through a pair of guide plates 330 and 332 by the action of a pair of discharge rollers 310 and 312, which are rotated in the direction shown by the arrow.

[Brief explanation of drawings]

FIG. 1 is a side view showing a first specific example of a forward/reverse rotation control mechanism constructed according to the present invention. FIG. 2 is a developed view drawn by the - line in FIG. 1. Third
FIG. 1 is an exploded perspective view showing the forward/reverse rotation control mechanism of FIG. 1; FIG. 4 is a side view showing a second specific example of the forward/reverse rotation control mechanism constructed according to the present invention. FIG. 5 is a developed view drawn by the - line in FIG. 4. FIG. 6 is a sectional view taken along the line -- in FIG. 5. FIG. 7 is a sectional view taken along the - line in FIG. 5. FIG. 8 is a simplified diagram showing the unloading section of the electrostatic copying apparatus for double-sided copying. 2 and 202...Forward/reverse rotation control mechanism, 4 and 2
04...Input rotating element, 6 and 206...First transmission train, 8 and 208...Second transmission train, 4
2 and 220...gear, 44 and 222...transmission member, 46 and 224...transmission coil spring, 48
and 226...gear, 50 and 228...transmission member, 52 and 230...transmission coil spring, 66...
Shaft member, 68 and 240...Output hub part, 72 and 244...Input hub part, 76 and 228...Output hub part, 80 and 258...Input hub part, 82
and 270...forward/reverse rotation control means, 88 and 27
6... Rotation control means, 238... First shaft member,
250...Second shaft member.

Claims (1)

[Claims] 1. An input rotating element to which rotational driving force is transmitted, a first
a transmission train, a second transmission train, an output rotational element, and a forward/reverse rotation control means, the first transmission train being drivingly connected to the input rotational element so as to rotate in a predetermined direction, and the first transmission train drivingly connected to the input rotational element so as to rotate in a predetermined direction; a driving force transmitting element having an input hub section for transmitting driving force in the predetermined direction to the output rotating element; and a transmission coil spring which is then fitted and wound in a direction opposite to the predetermined direction from an input side end located on the output hub side to an output side end located on the input hub side. The second transmission train includes: a transmission rotation element that is drive-coupled to the input rotation element so as to rotate in a direction opposite to the predetermined direction, and has an output hub portion; a driving force transmission element having an input hub portion for transmitting driving force in a direction opposite to that of the output hub portion, and a driving force transmission element having an input hub portion, the output hub portion being fitted over the outer periphery of both the output hub portion and the input hub portion; a transmission coil spring wound in the predetermined direction from the input side end located on the input hub side to the output side end located on the input hub side, and the outer diameter of the outer peripheral part of the input hub part is The outer diameter of the transmission coil spring is smaller than the outer diameter of the outer circumference of the output hub, and the inner diameter of the transmission coil spring is larger than the outer diameter of the outer circumference of the input hub. The forward/reverse rotation control means is formed to be smaller than the outer diameter, and includes a first control rotation element rotatably fitted to the transmission coil spring of the first transmission train, and a first control rotation element rotatably fitted to the transmission coil spring of the first transmission train. a second control rotational element rotatably fitted to the transmission coil spring; a non-operating position in which the actuation means does not act on the first and second control rotation elements; and a control rotation of the first and second control rotation elements. and a rotation control means having an actuation control member selectively positioned in an actuation position acting on the element, the input end of the transmission coil spring in the first transmission train being connected to the first control rotation element. connected,
The input side end of the transmission coil spring in the second transmission train is connected to the transmission rotation element, and the output side end is connected to the second control rotation element, and the actuation control member is connected to the locking portion. and a pressing portion, the first control rotation element is formed with a locked portion, the second control rotation element is constituted by a sleeve member, and the operation control member is When in the non-operating position, the locking portion is disengaged from the locked portion of the first control rotation element, the pressing portion is separated from the circumferential surface of the sleeve member, and the actuation control member is Normal rotation and reverse rotation characterized in that the locking part is locked to the locked part and the pressing part is pressed against the circumferential surface of the sleeve member when in the working position. Control mechanism. 2. The driving force transmission element of the first transmission train and the driving force transmission element of the second transmission train are provided in the output rotation element, and the transmission rotation element of the first transmission train is connected to the output rotation element. The transmission rotation element of the second transmission train is rotatably attached to the output rotation element and rotated in the predetermined direction, and the transmission rotation element of the second transmission train is rotatably attached to the output rotation element and rotated in the opposite direction to the predetermined direction. A forward/reverse rotation control mechanism according to claim 1, characterized in that: 3. The driving force transmission element of the first transmission train is the first
The driving rotation element of the first transmission train is rotatably mounted on the first shaft member and rotated in the predetermined direction, and the driving element of the second transmission train The force transmission element is provided on the second shaft member, and the transmission rotation element of the second transmission train is disposed on the second shaft member.
The first shaft member and the second shaft member are arranged in parallel and rotated in the same direction. 2. The forward/reverse rotation control mechanism according to claim 1, wherein the normal/reverse rotation control mechanism is drive-coupled so that one of the output rotating elements constitutes the output rotating element. 4. The first control rotation element is composed of a ratchet wheel,
2. The forward/reverse rotation control mechanism according to claim 1, wherein the locked portion is constituted by a pawl formed on a circumferential surface of the ratchet wheel. 5. When the actuation control member is moved from the inactive position to the actuated position by the actuating means, the locking part engages the claw before the pressing part is pressed against the circumferential surface of the sleeve member. When the actuation control member is locked to the pawl of the car and moved from the working position to the non-working position, the locking part is moved after the pressing part is separated from the circumferential side of the sleeve member. The distance between the pressing portion and the locking portion and the distance between the locking portion and the pawl are defined so that the lever is released from the pawl of the ratchet wheel. A forward/reverse rotation control mechanism according to claim 4. 6. The forward/reverse rotation control mechanism according to claim 4, wherein the actuating means comprises an electromagnetic solenoid. 7. The output rotating element according to any one of claims 1 to 6, characterized in that the output rotating element is constituted by a rotating shaft equipped with a conveying roller for conveying copy paper. Forward/reverse rotation control mechanism.