JPS6034827Y2 - Intermittent rotation drive device - Google Patents

Description

[Detailed description of the invention] The present invention provides an intermittent rotational drive device that transmits rotational power from a constantly rotating drive shaft to a driven shaft so that the driven shaft rotates by a predetermined angle. It is something to do.

Such an intermittent rotation drive device is required, for example, in an electrostatic copying machine.

In a cutting device that cuts a roll of copy paper for each copying operation, when a rotary blade having a single cutting edge is rotated multiple times, small chips of the copy paper are created, which may cause a paper jam.

Therefore, the main object of the present invention is to provide an intermittent rotational drive device that reliably rotates and displaces a driven shaft by a predetermined angle.

FIG. 1 is a perspective view of an electrostatic copying machine according to an embodiment of the present invention.

A transparent plate 4 on which a document is placed horizontally is provided at the top of the body 2.

The body 2 is provided with a document holding plate 6 for pressing the document onto the transparent plate 4.

A paper feeder 8 for feeding copy paper 20 wound into a roll, which will be described in detail later, is installed in the machine body 2 as shown in FIG. It can be pulled out to the right in Figure 1.

The length of the copy paper ejected from the machine 2 after copying is completed can be determined by manually positioning the knob 10 protruding from the upper front of the machine 2 in the left-right direction of the machine 2, and adjusting the length corresponding to the left-right position of the knob 10. You can choose exactly.

The number of copies of copy paper is set by a two-digit display tube 12, 14 provided at the upper front of the machine body 2.

To perform a copying operation, the number of copies to be made is set on the display tubes 12 and 14, and then the print button 16 is pressed.

The degree of shading of the image appearing on the copy paper can be set by a rotatable knob 18.

When copy paper becomes jammed in the machine body 2, a jam indicator lamp 19 lights up.

FIG. 2 is a simplified vertical sectional view of the copy sheet shown in FIG. 1, viewed from the front.

A paper feeding device 8 housing a holder 22 holding a roll of copy paper 20, a copy paper cutting device 24, a charging device 26, an exposure device 28, a magnetic brush developing device 30, and a pressure fixing device 32. The copy paper conveyance path 36 is provided in this order.
is formed.

In the optical device 38 for forming an image of the original onto photosensitive copy paper by the exposure device 28, the projection device 40 includes an exposure lamp 42 and a reflective wall 4 to project light onto the original through the transparent plate 4.
4, and the light projected onto the document from this projector 40 and reflected is transmitted from a reflecting mirror 46 to a movable reflecting mirror 48, a lens 50 having an in-mirror, and reflecting mirrors 52 and 53 to an exposure band d. Forms an image of the original.

During a copying operation, the light projection device 40 and the reflecting mirror 46 are driven by the motor 54 and run in the direction of an arrow 88 from the left to the right in FIG.
8 simultaneously run from the left to the right in FIG. 2 at a speed of 172 of the projector 40.

The light projecting device 40 and the movable reflecting mirror 48 are located at the rightmost end of the travel path in FIG. 2 at positions along imaginary lines 56 and 58.

FIG. 3 is a simplified perspective view showing the light projecting device 40, the reflecting mirror 46, and the moving device for the movable reflecting mirror 48, seen from behind the copy paper.

Pulleys 60 and 62 having horizontal axes are provided at both left and right ends of the body 2 and spaced apart in the horizontal direction.

The light projection device 40 and the reflector 46 are fixed to a support 64, which is guided along guide members 66, 68 so as to be horizontally movable.

The support body 70 supporting the movable reflector 48 has guides 72 .
74 so as to be horizontally movable.

A pulley 76 having a horizontal axis is pivotally supported on the support 70 .

The wire 78 has one end fixed to the support body 64 and wound around the pulleys 60, 62, 76 about half a turn each, and the other end 80 fixed to the body 2.

The other wire 82 has one end fixed to the support 64, wrapped around the pulley 76 about half a turn, and the other end 82.
4 is fixed to the fuselage 2.

Therefore, the support 64 is moved in the direction of movement 8 to the left in FIG.
8, the pulley 60 rotates in the direction of the arrow 86, and the movable reflector 48
It moves squarely in the same direction of movement 88 and at a speed of l/2.

Referring again to FIG. 2, in the paper feeder 8, the holder 22
The rolled copy paper 20 is decurled by a guide roller 90, and then passed to a pair of paper feed rollers 92. 92', it is guided to the copy paper cutting device 24.

The copy paper cutting device 24 includes a rotary blade 96 and a fixed blade 98, and the copy paper is cut by rotation of the rotary blade 96.

A pair of copy paper transport rollers 100 and 100', which are constantly driven by a motor 54, are provided in the machine body 2 above the charging device 26 in the copy paper transport path 36.

The charging device 26 includes a fine wire corona discharge electrode, and the charging device 26 includes a fine wire corona discharge electrode.
A uniform electrostatic charge is applied on the zero photoconductive layer.

A pair of copy paper transport rollers 104 and 104' are provided below the exposure zone d of the copy paper transport path 36.

The pair of copy paper conveying rollers 104, 104' are constantly driven by a motor 54.

Movement of the light projector 40 during copying operation and exposure band d
The movement of the copy paper on the copy paper conveyance path 36 in is performed in synchronization with the copy paper 2 charged by the charging device 26.
An image of the original is formed on the photoconductive layer 20, and an electrostatic latent image corresponding to the image of the original is formed on the copy paper 20.

The magnetic brush developing device 30 provided on the discharge side of the copy paper transport rollers 104, 104' includes a cylindrical developer holding member 108 which is provided on the copy paper transport path 36 and magnetically holds powdered toner on the surface. has.

The surface of the developer holding member 108 and the copy paper 20 holding the electrostatic latent image are visualized by powdered toner while being moved at the same speed.

Above the developer holding member 108 is a toner replenisher 1 that stores powdered toner for replenishment and replenishes the developer holding member 108.
10 are provided.

A guide roller 112 for guiding the copy paper is provided below the developer holding member 108.

A pressure fixing device 32 is provided on the discharge side of the magnetic brush phenomenon device 30.
is provided.

This pressure fixing device 32 has a pair of pressure rollers 114, 114' to which a predetermined pressure is applied.

The copy paper developed in the developing device 30 passes between the pair of pressure rollers 114, 114', thereby fixing the unfixed toner image on the copy paper.

A pair of ejection rollers 118 are provided on the ejection side of the fixing device 32.
, 11B' are provided to discharge the attached copy paper 20 onto the copy receiving plate 122.

FIG. 4 is a simplified rear view of the copier as seen from behind.

A sprocket wheel 130 is fixed to a rotating shaft 128 that is pivotally supported on the body 2.

The fuselage 2 has another sprocket wheel 1 horizontally spaced apart from the sprocket wheel 130.
32 is pivotally supported.

A chino 134 is wound endlessly between these sprocket wheels 130 and 132.

The moving member 136 fixed to the support body 64 is connected to the vertically elongated hole 13.
It has 8.

The longitudinal hole 138 has a protrusion 14 fixed to the chino 134.
0 is inserted loosely.

Therefore, when the sprocket wheel 130 rotates in the direction of the arrow 86 and the chino 134 travels, the prongs 140
causes the moving member 136 to reciprocate horizontally.

The movable member 136 is stationary at a rest position indicated by a phantom line 142 when copying is stopped.

When the print button 16 (see FIG. 1) is pressed, the drive device rotates the sprocket wheel 130 in the direction of arrow 86.

Therefore, the moving member 136 in the rest position 142 moves in the direction of the arrow 144.

Therefore, the moving member 136 is first detected by the paper feed detection member 146.

The paper feed detection member 146 is swingably supported by a swing shaft 148 on the body 2 in the middle of its longitudinal direction, and is swingably supported by a torsion spring (not shown) fitted into the swing shaft 148. A resilient force is applied around the moving shaft 148 in the counterclockwise direction of FIG.

The stopper 149 fixed to the fuselage 2 is connected to the swing shaft 14B.
limits the rotational displacement in the counterclockwise direction.

Referring to FIG. 5, the paper feed detection member 146 has a pin 150.
a stopper piece 154 that prevents the abutting piece 152 from rotating forward in the moving direction 144 of the moving member 136 around the pin 150; It is provided with a torsion spring 156 that is fitted into and elastically urges the contact piece 152 around the pin 150 toward the stopper piece 154 side.

Therefore, when the moving member 136 moves in the moving direction 144, it comes into contact with the contact piece 152, and moves the paper feed detection member 146 around the swing shaft 148 of the torsion spring fitted into the swing shaft 148. It is swung clockwise in FIG. 4 against the spring force.

When the protrusion 140 moves around the outer periphery of the sprocket wheel 130 in a semicircular arc to move the moving member 136 in the moving direction 88, the moving member 136 comes into contact with the abutment piece 152 again, but at this time the abutment piece 152 touches the pin 150. The paper feed detection member 146 only rotates counterclockwise in FIG.

The contact piece 15 with respect to the swing shaft 148 of the paper feed detection member 146
The end opposite to 2 abuts one end 159 of the link 158 .

The link 158 has elongated holes 160 and 162 along the longitudinal direction, and guide projections 164 and 166 provided on the body 2 are loosely inserted into the elongated holes 16G and 162, respectively.

In this way, the link 158 can be horizontally displaced, and the
Supported by

FIG. 6 is an enlarged rear view of the paper feeder 8 and its vicinity as seen from behind the copy paper.

The link 158 is connected to the paper feed detection member 14 by a spring 168.
An elastic force is applied to the 6 side (the right side in FIGS. 4 and 6), so that one end 159 of the link 158 is in contact with the paper feed detection member 146.

In order to be able to adjust the starting point of paper feed, the link 158 is adjustable in its length, and for this purpose one end 159 and the other end 170 of the link 158 are formed by a longitudinal projection. The length can be adjusted by means of mounting screws 172°174.

A swinging claw member 176 whose one end abuts the other end 170 of the link 158 is attached to the side wall of the paper feeder 8 .
It is pivotally supported around the

The swing claw member 176 is elastically biased clockwise in FIGS. 4 and 6 by a torsion spring (not shown) fitted into the swing shaft 178.

A pawl 180 is formed at the other end of the swing pawl member 176.

This pawl 180 meshes with the teeth of a rook 184 mounted on a rotating shaft 182 that is integral with the paper feed roller 92' (see FIG. 2).

The teeth of the pulley 184 are oriented to prevent the copy paper 20 from rotating in the paper feed rotation direction 186.

FIG. 7 is a horizontal sectional view of the vicinity of the paper feed roller 92'.

A sprocket wheel 188 is loosely fitted onto the rotating shaft 182, and the boss 19 of the sprocket wheel 188
0 extends along axis of rotation 182.

A one-way clutch 192 is attached to the rotating shaft 182 in a butting manner with a boss 190.

One-way clutch 192 transmits rotational power from its input end 194 in the direction of arrow 186 to rotary shaft 182, and does not transmit rotational power in the opposite rotational direction.

Such a one-way clutch 192 has a large number of rollers disposed in the circumferential direction and a large number of recesses that are narrowly inclined in the direction of the arrow 186 and are interposed between each roller and the outer peripheral surface of the rotating shaft 182. an input end 194 formed therein;
It may also be a conventional type in which the roller is caught between the outer peripheral surface of the rotating shaft 182 and the recess to transmit torque when the rotating shaft 4 rotates in the opposite direction of the arrow 186.

The sprocket wheel 188 is constantly rotationally driven by the motor 54.

An input end 194 of the one-way clutch 192 is formed with a portion having the same outer diameter as the outer diameter of the boss 190 of the sprocket wheel 188 .

A portion of the input end 194 and the outer periphery of the boss 190 are surrounded by a spring 196 .

The spring 196 is wound in a coil shape in a direction that tightens the boss 190 and the input end 194 in the paper feed rotation direction 186, and one end is connected to the water wheel 184 and the other end is connected to the input end 194.

In this way, the water wheel 184 and the spring 196 constitute a so-called wrap spring clutch 198.

When the moving member 136 is in the rest position 142 and the pawl 180 of the rocking pawl member 176 is engaged with the teeth of the water wheel 184, the spring 196 of the wrap spring clutch 198 is applied to the boss 190 of the rotating sprocket wheel 188. Loosen the tightening.

Therefore, the rotational power of sprocket wheel 188 is not transmitted to paper feed roller 92'.

When the moving member 136 moves in the direction of arrow 144 during copying and swings the paper feed detection member 146 clockwise in FIG. 4 around the swing shaft 148, the link 158 moves to the left in FIG. 4 and 6, the swinging pawl member 176 swings around the swinging shaft 178 in the counterclockwise direction in FIGS. 4 and 6.

Therefore, the pawl 180 comes out of mesh with the teeth of the water wheel 184.

Therefore, the spring 19 of the wrap spring clutch 198
6 integrally tightens the boss 190 of the rotating sprocket wheel 188 and the input end 194 of the one-way clutch 192.

Therefore, the rotational power from the sprocket wheel 188 is transmitted to the rotating shaft 182 via the wrap spring clutch 198 and the one-way clutch 192.

In this way, the paper feed roller 92' is connected to the other paper feed roller 9 only during the period when the pawl 180 and the waterwheel 184 are disengaged.
The copy paper 20 is sandwiched between the copy paper 20 and the copy paper 20 and is fed along the conveyance path 36.

In this embodiment, the length of the link 158 is adjusted and set in advance, and the paper feed detection member 146 is swung clockwise in FIG. 4 while the moving member 136 is moving in the direction of the arrow 144. In other words, the sheet feeding roller 92' is selected to rotate twice during the time that the moving member 136 moves by the length a (see FIG. 4) during which the moving member 136 is in contact with the abutting piece 152.

By rotating the paper feed roller 92' twice, the leading edge of the copy paper 20 located at the cutting device 24 is conveyed to at least a pair of copy paper conveyance rollers 100, 100'.

Since these pair of copy paper conveying rollers 100 and 100' are constantly rotated by the motor 54, the copy paper 2
0 is once pinched by the pair of copy paper conveying rollers 100, 100', the copy paper 20 remains in tension even when the pawl 180 and the water wheel 184 are engaged, and the one-way clutch 192 accordingly The paper feed roller 92' rotates freely together with the other paper feed roller 92.

By appropriately adjusting and setting the length of the link 158, the time point at which the claw 180 and the water wheel 184 are separated from each other, that is, the time point at which paper feeding starts can be selected.

For example, by extending the one end 159 and the other end 170 in a direction other than their axial directions to make the entire length of the link 158 longer, the paper feeding start point can be brought forward.

Further, the paper feeding start point can be accurately adjusted and set by visual inspection.

Therefore, there are advantages in that the paper feeding timing can be accurately and easily adjusted, and maintenance is easy.

FIG. 8 shows a state in which the paper feeder 8 is pulled out from the machine body 2 by a telescopic guide rail 200.

The swing claw member 176 is connected to the claw 180 and the water wheel 184 by a torsion spring (not shown) fitted into the swing shaft 178.
If the paper feed roller 92' undesirably retracts rotation 20 into the paper feeder B, the paper feed roller 92' Rotating shaft 182
The copy paper 20 may be fed to the cutting device 24 by rotating a rotary knob 202 (see FIG. 7) fixed to the copy paper 20 between the paper feed rollers 92 and 92'.

When rotating the rotation knob 202 in the paper feed rotation direction 186, the paper feed roller 92 is rotated by the action of the one-way clutch 192.
becomes playful.

Therefore, the copy paper can be conveyed to the cutting device 24 while the engagement between the rook 184 and the claw 180 of the swinging claw member 176 is always maintained.

In this embodiment, the copy paper is transported such that when the copying operation is completed and the moving member 136 returns to the rest position 142, the copy paper has been discharged onto the copy receiving plate 122 by the discharge rollers 118, 118'. Select the length of path 36.

FIG. 9 is a front view of the copying paper as seen from the front, showing a state in which the front cover of the copying machine is removed.

The knob 10 is horizontally displaceable along the guide rod 201.

The knob 10 is connected to a wire 213 stretched between pulleys 203 and 205.

FIG. 10 is a perspective view of a portion of the back of the copying machine seen through from the front.

Referring also to FIG. 9, a rotating shaft 211 is pivotally supported through the body 2 in its width direction.

A pulley 217 is fixed to this rotating shaft 211 on the front side of the copying machine, and the pulley 217 and the pulley 205
A wire 215 is wound endlessly between the two ends.

A pulley 214 is fixed to the rotating shaft 211 at the rear of the copying machine as shown in FIG.

A support wall 204 is fixed to the body 2, and guides 206 and 208 are fixed to the support wall 204 along the horizontal movement direction of the moving member 136.

The movable support member 210 is mounted so as to be horizontally movable along the guides 206 and 208.

The movable support member 210 is fixed to both ends of a wire 216 stretched between pulleys 212 and 214 provided at both ends in the moving direction.

A rotation shaft 235 of the pulley 212 is pivotally supported by the support wall 204.

Therefore, by horizontally moving the knob 10 shown in FIG.
rotates.

Therefore, the wire 215 moves and the pulley 217 and its rotating shaft 211 rotate.

Therefore, as shown in FIG. 10, the pulley 214 that is integral with the rotating shaft 211 rotates and the waist wire 216 moves.

Therefore, as the wire 216 moves, the movable support member 21
0 can be moved.

A cutting detection member 218 is pivotally supported by a rotation shaft 219 on the movable support member 210, and a deenergization detection member 222 is pivotally supported by a rotation shaft 220.

The cutting detection member 218 is provided relatively rearward along the exposure movement direction 88 of the moving member 136, whereas the deenergization detection member 222 is provided relatively forward in the exposure movement direction 88. It is being

The cutting detection member 218 and the deactivation detection member 222 rotate clockwise in FIG. 10 only when the moving member 136 moves in the exposure movement direction 88, and when moving in the opposite direction 144, their upper parts 223 .225 is pin 224,2
26 in a counterclockwise direction in FIG. 10, such structure is similar to that described in connection with FIG.

A tilting member 228 is pivotally supported on the support wall 204 by a pivot axis parallel to the stretching direction of the wire 216, and another tilting member 230 is similarly pivotally supported on the outside of this tilting member 228.

The tilting members 228 and 230 tilt about the rotation axis along the exposure movement direction 88 in response to the clockwise rotation of the cut detection member 218 and the deenergization detection member 222, respectively.

One end of a swinging rod 232, which is pivotally supported on the support wall 204 by a pin 233, contacts the tilting member 230, and the other end of this swinging rod 232 contacts one end of a swinging claw member 234, as shown in FIG. come into contact with

The swinging claw member 234 is pivotally supported on the body 2 by a swinging shaft 236, and a claw 238 is provided at the other end of the swinging claw member 234.
is formed.

An actuation rod 242 has a pawl 240 that engages pawl 238.
It is pivotally supported on the body 2 by a swing shaft 244.

The swing claw member 234 is given an elastic force in the counterclockwise direction in FIG. 4 by a torsion spring (not shown) fitted into the swing shaft 236.

Actuation rod 242 is actuator 248 of switch 246
It is for operating the.

A spring force of an actuator 248 applies a resilient force in the clockwise direction in FIG. 4 to the operating rod 242. As shown in FIG.

Pawl 238 when moving member 136 is in rest position 142
, 240 are not engaged.

During copying, the moving member 136 moves from its rest position 142 in the moving direction 144 to push down the actuating rod 242.

Then, the pawl 240 engages with the pawl 238 as shown in the fourth figure, and the engaged state is maintained.

When the operating rod 242 is pushed down by the moving member 136, the actuator 248 of the switch 246 is pushed down and the switch 246 is turned on.

FIG. 12 is an electrical circuit diagram of the electrostatic copying machine.

The switch 246 is commonly connected in series to the exposure lamp 42 and the charging device 26 which are connected in parallel, and when the switch 246 is turned on, the exposure lamp 42 is turned on and the charging device 26 charges the copy paper 20. It is in an operational state where it can be used.

A print switch 568 is connected in series to the motor 54.

The print switch 568 remains conductive when the print button 16 is depressed and shuts off when the moving member 136 returns to its original rest position 142.

When the moving member 136 moves from the position of the pulley 130 in the exposure movement direction 88, the cutting detection section 218 is rotated counterclockwise in FIGS. Have it cut.

Furthermore, the moving member 136 rotates the deenergization detection member 222.

Referring to FIG. 11, a state in which the moving member 136 rotates the deenergization detection member 222 in the counterclockwise direction is shown.

The deenergization detection member 222 pushes down the tilting member 230, thereby causing the swinging rod 232 to disengage the claw 238 of the swinging claw member 234 from the claw 240 of the actuation rod 242, and accordingly, the switch 2
46 is cut off.

Therefore, the exposure lamp 42 and the charging device 26 are deenergized.

The distance b (see FIG. 4) between the cutting detection member 218 and the deenergization detection member 222 along the exposure transport direction 88 is the same as that of the cutting device 24.
The distance C from the cutting position to the front end 250 of the exposure zone d of the exposure device 28 in the copy paper transport direction is selected to be equal to or slightly longer.

Therefore, the rear end of the copy paper 20 is cut and the exposure zone d
The exposure lamp 42 can be deenergized at the same time or after passing the front end 250 of the.

FIG. 13 is an enlarged view of the cutting device 24 seen from behind the copying machine.

The link 252 whose upper end is in contact with the tilting member 228 is
It has longitudinal holes 254 and 256.

Pins 258 and 260 fixed to the body 2 are fitted into these vertical holes 254 and 256, thereby allowing the link 252 to move up and down.

The link 252 is in contact with an abutting portion 264 of a double member 262 .

The multilayer member 262 is pivotally supported by the body 2 by a swing shaft 266.

The double member 262 has a control pawl 268 and a rotation stopping pawl 270 that are positioned at different positions in the circumferential direction around the swing axis 266 .

FIG. 14 is a longitudinal sectional view of the cutting device 24.

The double member 262 has a gear 276 on a rotary shaft 274 that is integral with the rotary blade 96 to which a resilient force in the clockwise direction in FIG.
is loosely fitted.

The gear 276 has a boss 2 extending along the rotation axis 274.
It has 78.

Gear 276 meshes with gear 280. Sprocket wheel 281 integral with gear 280 and sprocket wheel 188 associated with rook 184 are connected via chino 283.

The gear 280 meshes with a gear (not shown) that is pivotally supported on the machine body 2 side and is constantly rotationally driven by the motor 54. When the paper feed device 8 is pulled out from the machine body 2, the gear 280 meshes with the gear 280. The meshing with the gear on the fuselage 2 side, which is currently in operation, can be disengaged.

The double water wheel 282 is loosely fitted onto the rotating shaft 274.

This compound water wheel 282 has control teeth 284 and rotation stopping teeth 286 that prevent rotation of the rotary blade 96 at different positions in the axial direction and the circumferential direction.

In this embodiment, these teeth 284, 286 are formed on one diameter line of the compound water wheel 282.

A boss member 288 is fixed to the rotating shaft 274,
This boss member 288 abuts against the boss 278 of the gear 276 in the axial direction.

A spring 290 is provided surrounding the boss 278 and the boss member 288.

This spring 290 has a winding direction that tightens the boss 278 and the boss member 288 along the rotation direction 298 of the rotary blade 96, and has one end connected to the boss member 288 and the other end connected to the compound water wheel 282. Ru.

The compound water wheel 282 and the spring 290 constitute a so-called wrap spring clutch 292.

FIG. 15 is an end view taken along line xv-xv in FIG. 14.

The rotary blade 96 has, for example, 28 blades around its axis of rotation.
The cutting edge 294 has a spirally twisted cutting edge 294.

The fixed blade 98 has a linear cutting blade 29 parallel to the rotating blade 96.
It has 6.

In the state shown in FIG. 15, a gap is provided between the cutting blades 294 and 296 to form a copy paper conveyance path 36, and the copy paper passes through this gap, causing the rotary blade 96 to rotate in the rotation direction 298. The copy paper is cut.

At the time of this cutting, the copy paper moves along the conveyance path 36 at the arrow 299.
While being conveyed in this direction, the copy paper is continuously cut from one end to the other end in the width direction by blades 294 and 296.

Therefore, it takes some time for the copy paper to be cut over its entire width, and the copy paper is being conveyed during this time as well.

According to the above-mentioned rotary blade 96, the front end of the cut subsequent copy paper does not come into contact with the cutting blade 294 and its conveyance is prevented.

Therefore, an excellent advantage is exhibited in that the cutting blade 294 does not bend the copy paper and cause a paper jam.

Referring again to FIGS. 4, 13, and 14, when the movable member 136 is not in contact with the cutting detection member 218 and is not rotating, the control teeth 284 of the compound water wheel 282 control the compound claw member 262. The pawls 268 are engaged, so that the compound water wheel 282 is prevented from rotating.

Gear 280 and gear 276 are rotationally driven, and the direction of rotation of gear 276 is indicated by arrow 298.

The wrap spring clutch 292 loosens the boss 278 of the gear 276 and the boss member 288.
The rotational power from is not transmitted to the rotating shaft 274.

When the moving member 136 moves in the exposure movement direction 88 and rotates the cutting detection member 218 in the counterclockwise direction in FIGS. 4 and 11 around the rotation axis 219, the tilting member 228
presses link 252.

Therefore, the multi-jaw member 262 resists the elastic force of the torsion spring 272 fitted into the swing shaft 266, and
Rotate counterclockwise as shown in Figure 3.

Therefore, the control teeth 284 of the compound water wheel 282 and the compound pawl member 262
is disengaged from the control pawl 268.

Therefore, the compound water wheel 282 is allowed to rotate in the direction of arrow 298.

In response, the spring 290 of the wrap spring clutch 292 tightens the boss 278 and the boss member 288, so that rotational power from the gear 276 is transmitted via the wrap spring clutch 292 to the rotating shaft 274 and rotating blade 96.

During the time t1 during which the compound water wheel 282 and therefore the rotary blade 96 rotates in the rotation direction 298 by an angle smaller than 360 degrees but close to 360 degrees, the rotary blade 96 rotates at a high speed.
It is relatively short and shorter than the time t2 during which the moving member 136 moves by a distance a in the direction of the arrow 88 and keeps the cut detection member 218 rotated counterclockwise in FIG. 4 (t1<t
2).

Therefore, after the rotation stop tooth 286 rotates by a little less than 360 degrees, it engages with the rotation stop pawl 270, and the compound water wheel 282 is prevented from rotating further.

Therefore, further rotation of the rotary blade 96 is prevented by the action of the wrap spring clutch 292.

After the control tooth 284 and the control pawl 268 are disengaged, the compound water wheel 282 rotates and the rotation stopper tooth 286 and the rotation stopper pawl 270 are engaged with each other. The tooth heights g and h of 284 and 286 are determined by the relationship g x h.

When the rotation stopper tooth 286 is engaged with the rotation stopper pawl 270, when the movable member 136 moves further in the direction of arrow 88 to break contact with the cutting detection member 218, the multi-jaw member 262 rotates back clockwise in FIG. 13 around the swing shaft 266 due to the elastic force of the torsion spring 272.

Therefore, the compound water wheel 282 rotates in the direction of the arrow 298, and the control teeth 284 and the control claws 268 engage with each other.

In this way it returns to its original state.

Since the rotary blade 96 does not rotate more than 360 degrees, the production of paper scraps is prevented, and the occurrence of paper jams due to this is eliminated.

Referring to FIGS. 9 and 14, a hand-cutting lever 304 is attached to the other end of the rotating shaft 274 of the rotary blade 96 via a one-way clutch 302. As shown in FIGS.

The one-way clutch 302 transfers its torque to the rotating shaft only when the manual lever 304 is rotated in the rotational direction 298.
It works to convey information to 74.

The swing angle of the manual cutting lever 304 is limited by stoppers 303 and 305 erected on the machine body 2.

The one-way clutch 302 may be conventional;
For example, the input end 194 has a large number of rollers disposed in the circumferential direction and a large number of recesses that are narrowly inclined in a direction opposite to the rotational direction 298 by interposing each roller with the outer peripheral surface of the rotating shaft 274. and when the manual cutting lever 304 rotates in the rotational direction 298, the roller may be inserted between the outer peripheral surface of the rotating shaft 274 and the recess to transmit torque. .

Referring to FIG. 6, a push-down piece 300 having an inclined surface inclined upward toward the multi-claw member 262 is fixed to the body 2.

The push-down piece 300 moves the paper feeder 8 to the machine body 2 as shown in FIG.
When the multi-claw member 262 is pulled out from the
Unravel the mesh with.

Therefore, when pulling out the paper feeding device 8 from the machine body 2 as shown in FIG. Turn the knob 202 to bring the copy paper between the cutting blades 294 and 296.

In this state, swing the manual cutting lever 304 to remove the rotary blade 96.
is rotated in the direction of rotation 298 from pin 303 to pin 305 to cut the copy paper and prepare it for copying operation.

The one-way clutch 302 is manually cut off using the lever 304 and the rotary blade 9.
6, the rotary blade 96 can be rotated simply by swinging the hand-cut lever 304, and conversely, the torque from the rotary blade 96 is not transmitted to the hand-cut lever 304.

Therefore, the rotary blade 96 can be rotated by a relatively small swing angle displacement of the hand-cutting lever 304, and the torque of the rotary blade 96 is not connected to the hand-cutting lever 304, so that when the rotary blade 96 rotates during the copying operation. The inertial force is suppressed to a small level, so that the rotary blade 96 can be reliably stopped by the engagement between the rotation stopper tooth 286 and the rotation stopper pawl 270, and the impact force at the time of stop is small.

In another embodiment of the present invention, the rotary blade 96 has a plurality of cutting blades 2.
94 spaced apart in the circumferential direction, the rotation thereof is such that only one of the cutting blades 294 cuts the copy paper together with the cutting blade 296 of the fixed blade 98 for each copying operation. It is sufficient to prevent rotational angular displacement of the blades 96, and it is easy for those skilled in the art to deform the multi-claw member 262 and the multi-turbine 282 in this way.

Such modifications are also included within the spirit of the invention.

The present invention can also be implemented in conjunction with a rotary blade that rotates 360 degrees in a cutting operation.

The present invention can be implemented not only in cutting devices for electrostatic copying machines but also in other applications.

As described above, according to the present invention, the rotation of the driven shaft is started by disengaging the control claw of the multi-jaw member and the control teeth of the compound water wheel, and the rotation of the driven shaft is stopped at a predetermined angle. This is done by the meshing of the rotation-stopping pawl, which is integral with the control pawl, with the rotation-stopping teeth of the compound water wheel. Reach a position where you can fit.

Therefore, the driven shaft is prevented from running away, and after the driven shaft has rotated by a predetermined rotation angle, further rotation is reliably prevented.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an electrostatic copying machine according to an embodiment of the present invention, Fig. 2 is a simplified vertical sectional view of the copying machine shown in Fig. 1 as seen from the front, and Fig. 3 is a view from behind the copying machine. A simplified perspective view showing the light projection device 40, the reflecting mirror 46, and a moving device for the movable reflecting mirror 48, FIG. 4 is a simplified rear view of the copier as seen from behind, and FIG. 5 shows the paper feed. A front view showing the upper part of the detection member 146, FIG. 6 is the paper feeding device 8 seen from the back of the copying machine.
7 is a horizontal sectional view of the vicinity of the paper feed roller 92', and FIG. 8 is a rear view showing the paper feed device 8 pulled out from the machine body 2 by the telescopic guide rail 200. Figure 9 is a front view of the copying machine seen from the front, Figure 10 is a perspective view showing a part of the back seen from the front of the copying machine, and Figure 11 is a part seen from the back of the copying machine. FIG. 12 is an electrical circuit diagram of the electrostatic copying machine, FIG. 13 is an enlarged view of the cutting device 24 seen from behind the copying machine, and FIG.
The figure is a longitudinal sectional view of the cutting device 24, and FIG. 15 is an end view taken along the cutting plane line xv-xv in FIG. 14. 24... Cutting device, 262... Multi-claw member, 264... Contact portion, 266... Swinging portion, 268... Control claw, 270...
Rotation stopping claw, 274...Rotation shaft, 282...
...Double water wheel, 284...Control teeth, 286...
...Rotation stop teeth.

Claims (1)

[Scope of Claim for Utility Model Registration] A driven shaft, a drive shaft that is loosely fitted to the driven shaft and has a boss that extends along the driven shaft and is constantly rotating, and a wrap spring clutch that is connected to the driven shaft. a compound pawl wheel that is loosely fitted and has control teeth and rotation stopping teeth that prevent rotation at different positions in the axial direction and the circumferential direction; Such a wrap spring clutch includes a spring having a winding direction in the direction of tightening along the driven shaft and connected at one end to a driven shaft and at the other end to a multi-claw wheel; a control pawl and a rotation stop pawl that are movably supported and mesh with the control tooth and the rotation stop tooth, respectively, and when one combination of the teeth and the pawl is in mesh with the other combination; An intermittent rotation drive device comprising: a multi-claw member that disengages from meshing with the multi-claw member.