JP2009244469A - Braking device of mover and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To apply a shock absorbing function to a mover at a low cost without adding an additional braking device. <P>SOLUTION: In a cover 200 to which a write device 150 of an image forming apparatus 100, the rotary motion of a shaft body 202 is operatively connected with a heat roller 170 through a one-way clutch 310 only in the closing operation. A pressure roller 180 is brought into pressure contact with the heat roller 170 and driven to rotate, whereby braking force is applied to the heat roller 170. Thus, in the closing operation state, braking force is applied to a door member 201, so that in closing the cover 200, no shock is not applied to the write device 150. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a movable body braking apparatus and an image forming apparatus, and more particularly to a movable body braking apparatus and an image forming apparatus that can apply a braking force to the rotational movement of the movable body without adding a separate braking member.

  In general, there is an image forming apparatus provided with a writing unit using an optical device using a laser beam. Such an image forming apparatus cannot write a good image when an impact or vibration is applied to the writing unit. In general, the unit is fixed to a main unit that is not moved.

  However, when the writing unit is fixed to the apparatus main body, it is necessary to avoid the writing unit fixed to the apparatus main body when attaching or detaching the photoconductor unit when exchanging consumables. Becomes larger.

  In order to improve the operability in exchanging consumables, image forming apparatuses tend to be provided with a large number of openings and a large number of movable bodies such as door members that close such openings.

  In Patent Document 1, in an image forming apparatus, when an impact resistant component such as an optical component for writing is disposed below the opening / closing member, a leaf spring is disposed on the opening / closing member to press the optical component. And what is positioned is described.

  As described above, when a large number of movable bodies are provided, the location of the functional components in the apparatus is also limited. The functional components are installed on the movable body side, and the movable body and the functional components are moved in conjunction with each other.

In Patent Document 2, a writing unit is installed on the upper cover of the rotatable image forming apparatus, and the upper cover is urged in the opening direction with respect to the main body apparatus so that the writing apparatus is not shocked when the upper cover is closed. What was done is described.
JP 08-194346 A JP 02-210462

  As described above, when functional parts are arranged on the movable body, it is necessary to prevent damage to the functional parts due to an impact when the movable body is opened and closed. For this reason, a brake device such as a brake or a damper can be mounted on the movable body for the purpose of absorbing the impact of the movable body. However, if the brake or the damper is incorporated as a single functional component, the number of parts increases and the cost increases. There's a problem.

  SUMMARY An advantage of some aspects of the invention is that it provides a movable body braking device and an image forming apparatus that can add a buffer function to the movable body at low cost without adding an additional braking device.

  The invention according to claim 1 is a rotary drive unit that is connected to a drive source and is driven to rotate, a driven rotary unit that pressurizes and contacts the rotary drive unit, and provides resistance to rotation of the rotary drive unit; A movable body connected to the device via a shaft body and capable of rotating in both the forward direction and the reverse direction by an external operation, and when rotating in one direction out of both directions of the movable body, A one-way clutch that transmits this rotation to the rotational drive body to apply a braking force to the rotational operation of the movable body, and idles without transmitting the rotation to the rotational drive body when the movable body rotates in the other direction. A braking device for a movable body, comprising:

  According to a second aspect of the present invention, in the movable body braking device according to the first aspect, the movable body is fixed to a shaft body rotatably supported by the device, and the shaft body and the rotary drive body are disposed between the shaft body and the rotary drive body. The one-way clutch is arranged in

  According to a third aspect of the present invention, in the movable body braking device according to the first or second aspect, when the drive source rotates between the rotary drive body and the drive source, the rotation is transmitted to the rotary drive body, and the rotation A second one-way clutch that does not transmit rotation to the driving source when the driving body rotates is arranged.

  According to a fourth aspect of the present invention, there is provided the movable body braking apparatus according to any one of the first to third aspects, wherein the movable source rotates the rotary drive body via the one-way clutch in the direction in which the drive source is the second one-way. The direction is the same as the direction in which the rotary drive is rotated via the clutch.

  According to a fifth aspect of the present invention, the movable body braking device according to any one of the second to fourth aspects is provided, wherein the rotational driving body and the driven rotational body are driving members built in the fixing device, and the movable body is The image forming apparatus is a door member that is disposed in the apparatus and that rotates to open and close the opening of the apparatus.

  According to a sixth aspect of the present invention, in the image forming apparatus according to the fifth aspect, the rotation driving body is a heating roller of a fixing device, and the driven rotating body is a pressure roller of the fixing device.

  According to a seventh aspect of the present invention, in the image forming apparatus according to the fifth aspect, the rotary driving body is an endless belt device including a heater therein.

  According to an eighth aspect of the present invention, in the image forming apparatus according to the fifth aspect, the door member includes a lock member that engages with the apparatus casing when the opening of the apparatus casing is closed.

  According to a ninth aspect of the present invention, in the image forming apparatus according to any one of the fifth to eighth aspects, the braking force of the door member applied by the rotary drive body overcomes the moment applied to the door member by gravity. It is characterized by.

  According to a tenth aspect of the present invention, in the image forming apparatus according to any one of the fifth to ninth aspects, the rotation driving body is fixedly attached to the apparatus, and the driven rotation body is movably disposed in the apparatus housing. The rotary drive member is in pressure contact.

  The invention of claim 11 is the image forming apparatus according to any one of claims 5 to 10, comprising an image carrier, a latent image forming device for writing an electrostatic latent image on the image carrier, and a developing device, The latent image forming apparatus is arranged on the back side of a door member that opens and closes an opening for removing a developing device.

  According to the present invention, there is provided a one-way operation for a rotary drive unit that is connected to a drive source and is driven to rotate, and a driven rotary unit that is driven to rotate by being in pressure contact with the rotary drive unit and provides resistance to the rotation of the rotary drive unit. Since the rotation can be transmitted through the clutch and a braking force can be applied to the rotation of the movable body in one direction, a buffer function can be imparted to the movable body at low cost without arranging additional braking parts. it can.

  The best mode for carrying out the present invention will be described below with reference to the embodiments shown in the drawings.

  Hereinafter, an image forming apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view illustrating a schematic configuration of an image forming apparatus according to an embodiment.

  The image forming apparatus 100 includes a paper storage unit 110 that stores the printing paper S in a housing 101, a paper conveyance path 120, a toner image forming device 130, a transfer device 140, a writing device 150, a fixing device, and the like. A value 160. In addition, the housing 101 is formed with a paper discharge tray 190 from which the printed printing paper S is discharged.

  In addition to the guide member, a paper feed roller 121, a registration roller pair 122, and a paper discharge roller pair 123 that separate the printing paper S from the paper storage unit 110 one by one are disposed in the paper conveyance path 120.

  The toner image forming apparatus 130 includes a toner T and a photosensitive roller 131, a magnetic brush 132, a stirring roller 133, and a charging device 134 as latent image carrying means. The writing device 150 includes a laser diode 151 that generates laser light, a reflecting mirror 152, and the like. In the transfer device 140, a transfer roller 141 is disposed so as to face the photosensitive roller 131.

  The fixing device 160 includes a heating roller 170 with a built-in heater 171 and a pressure roller 180 that is pressure-bonded to the heating roller. In this example, the heating roller 170 is a driving rotating body driven by a driving source (not shown), and the pressure roller 180 is a driven rotating body that rotates in contact with the heating roller 170. The pressure roller 180 can be a driving rotator, and the heating roller 170 can be a driven rotator.

  In order to perform printing with such an image forming apparatus 100, a laser beam from the writing device 150 is irradiated onto the photosensitive roller 131 in accordance with an instruction from the host apparatus, a latent image is formed on the photosensitive roller 131, and a magnetic brush. The toner T is applied to the photosensitive roller 131 by 132 and developed. On the other hand, the sheets are separated one by one from the bundle of printing sheets S in the sheet storage unit 110 by the sheet feeding roller 121, and reach the nip portion between the photosensitive roller 131 and the transfer roller 141 through the registration roller pair 122. The toner image formed on the photosensitive roller 131 is transferred to the printing paper S, the toner image is heated and fixed on the printing paper S by the fixing device 160, and is discharged to the paper discharge tray 190 by the paper discharge roller pair 123.

  In addition, the image forming apparatus 100 is provided with a lid 200 that is a movable body that can be rotated in both the forward direction and the reverse direction by an external operation so that the consumables can be easily exchanged. Yes. FIG. 2 is a cross-sectional view showing the arrangement of the lids in the image forming apparatus according to the embodiment, and FIG. In such an image forming apparatus 100, a toner image forming apparatus 130 is attached to a casing 101 in order to replace consumables. In order to facilitate removal of the toner image forming apparatus 130, an opening 210 is formed in the upper portion of the housing 101, and a lid 200 that opens and closes is disposed in the opening 210. The lid body 200 is configured such that a plate-like door member 201 is disposed on the housing 101 so as to be opened and closed by a shaft body 202. The door member 201 is desirably provided with a lock device (not shown) that engages with the housing 101 of the image forming apparatus.

  In this example, a writing device 150 is disposed below the lid 200 via an elastic body 153. When the lid 200 is rotated, the transfer device 140 moves upward as the lid 200 rotates, and the opening 210 is opened.

  Normally, the opening 210 is closed by the lid 200 as shown in FIG. On the other hand, when the toner image forming apparatus 130 is removed from the housing 101, as shown in FIG. 3, the lid 200 is rotated around the shaft body 202 to open the opening 210. Thereby, the toner image forming apparatus 130 can be removed from the opening 210.

  Next, the braking device 300 arranged on the lid 200 will be described. 4 is a perspective view showing a braking device arranged in the image forming apparatus, and FIG. 5 is a schematic diagram showing the braking device shown in FIG. The braking device 300 includes a one-way clutch 310 attached to the shaft body 202 of the lid body 200 and a lid body driving gear 320 that transmits rotation to the one-way clutch 310. The door member 201 is fixed to the shaft body 202, and the shaft body 202 rotates with the rotation of the door member 201. Further, the one-way clutch 310 transmits the rotation to the lid driving gear 320 when the lid 200 rotates in the closing direction, that is, when the shaft body 202 rotates in the closing direction, and the lid 200 opens in the opening direction. When the shaft body 202 is rotated, that is, when the shaft body 202 is rotated in the opening direction, it rotates idle and does not transmit the rotation to the lid driving gear 320.

  The braking device 300 includes a drive train 330 that transmits rotation from a drive source (not shown) such as a motor, a second one-way clutch 340 that meshes with a final gear of the drive train 330, and a second one-way. Clutch 340, output gear 350 disposed on the output shaft of second one-way clutch 340, fixing roller driving gear 360 connected to heating roller 170, idler gear meshing with fixing roller driving gear 360 and meshing with 320 370. The heating roller 170 is arranged so that the pressure roller 180 comes into contact with the heating roller 170, and the pressure roller 180 is pressed against the heating roller 170 with a predetermined pressure by a pressing spring 181, and is driven by the rotation of the heating roller 170. Then, a predetermined braking force is applied to the rotation of the heating roller 170.

  Next, the operation of the braking device 300 will be described. This operation is summarized in Table 1.

  First, the printing operation will be described. During the printing operation, the drive train 330 is driven by the motor, and the rotation of the drive train 330 of the second one-way clutch 340 is transmitted to the fixing roller drive gear 360 via the output gear 350. Further, the rotation of the fixing roller driving gear 360 is transmitted to the lid driving gear 320 via the idler gear 370, but the one-way clutch 310 is idled so that the shaft body 202 does not rotate and the rotation is not transmitted to the door member 201. By this operation, the heating roller 170 is driven in the forward direction ((+) in the figure). When the heating roller 170 rotates in the forward direction (+), the second one-way clutch 340 idles and does not transmit the rotation to the drive train 330 side (fixing drive rotation in Table 1).

  Further, when the door member 201 is changed from the closed state to the closed state, the one-way clutch 310 idles and rotation is not transmitted to the lid driving gear 320. For this reason, the rotation of the door member 201 in the opening direction is light with no braking force applied (in Table 1, the lid opening operation).

  On the other hand, when the door member 201 is changed from the open state to the closed state, the one-way clutch 310 transmits the rotation to the lid driving gear 320. This rotation is transmitted to the fixing roller driving gear 360 via the idler gear 370, and rotates the heating roller 170 in the forward direction. For this reason, the pressure roller 180 is driven by the rotation of the heating roller 170, and a braking force is applied to the rotation of the heating roller 170. Then, the braking force by the pressure roller 180 is transmitted to the one door member 201 via the fixing roller driving gear 360, the idler gear 370, the lid driving gear 320, and the one-way clutch 310, so that the door member 201 is moved in the closing direction. The rotation is heavy due to the addition of braking force (in Table 1, lid closing operation).

  Accordingly, when the door member 201 is closed, a braking force is applied to the door member 201, so that the door member 201 is prevented from being closed with an impact, and the writing device 150 installed in the door member 201 is impacted. It is prevented from joining.

  The braking force applied to the door member 201 by the pressure roller 180 can be changed by the gear ratio of the idler gear 370, the lid driving gear 320, and the fixing roller driving gear 360. It is desirable that this braking force overcomes the moment applied to the door member 201 by the weight of the door member 201 and the writing device 150 added. In this way, it is possible to prevent the door member 201 from being closed without being operated.

  Moreover, although the example which attached the writing device inside the cover body was demonstrated in the said example, the apparatus arrange | positioned inside a cover body may be another apparatus, and a device is attached to a cover body. It may not be possible.

  In the above example, the rotation driving body is a heating roller having a fixing device value. However, this may be another roller. Moreover, although the rotation drive body showed the example which was a cylindrical roller, this can be made into the drive roller which is a rotation member of an endless belt apparatus provided with a heater inside.

  Further, the braking device according to this example is applied to the image forming apparatus. However, the braking device according to the present embodiment is applied to other devices as long as the rotational driving body and the driven rotational body capable of generating the braking force are arranged inside the apparatus. can do.

  As described above, according to the present invention, by reducing and buffering the impact when the movable body is closed, it is possible to protect the parts that are vulnerable to the impact engaged with the movable body from being damaged. Since the braking force generated by the driving body and the driven rotating body is used, it is not necessary to add a dedicated braking mechanism, and the cost can be reduced and the number of parts can be reduced.

  Further, in the present invention, since the one-way clutch is used, it is possible to apply differently heavy operation forces to the movable body for each operation state.

1 is a cross-sectional view illustrating a schematic configuration of an image forming apparatus according to an embodiment. FIG. 3 is a cross-sectional view illustrating an arrangement state of a lid in the image forming apparatus according to the embodiment. FIG. 3 is a cross-sectional view showing a state of replacement of consumables in the image forming apparatus shown in FIG. 2. It is a perspective view which shows the braking device arrange | positioned at the image forming apparatus. It is a schematic diagram which shows the braking device shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Image forming apparatus 101 Housing | casing 110 Paper storage part 120 Paper conveyance path 121 Paper feed roller 122 Registration roller pair 123 Paper discharge roller pair 130 Toner image forming device 131 Photoconductor roller 132 Magnetic brush 133 Stir roller 134 Charging device 140 Transfer device 141 Transfer roller 150 Writing device 152 Laser diode 151 Reflecting mirror 153 Elastic body 160 Fixing device value 170 Heating roller 171 Heater 180 Pressing roller 181 Pressing spring 190 Paper discharge tray 200 Cover body 201 Door member 202 Shaft body 210 Opening 300 Braking device 310 One-way clutch 320 Cover drive gear 330 Drive train 340 Second one-way clutch 350 Output gear 360 Fixing roller drive gear 370 Idler gear S Printing paper T Toner

Claims (11)

A rotary drive connected to the drive source and driven to rotate, a driven rotary that presses and contacts the rotary drive to rotate the driven drive and provides resistance to the rotation of the rotary drive, and a shaft to the device. And a movable body that can be rotated in both the forward and reverse directions by an external operation,
When the movable body rotates in one direction out of both directions, this rotation is transmitted to the rotational drive body to apply a braking force to the rotational operation of the movable body, while the movable body rotates in the other direction. A movable body braking device comprising a one-way clutch that idles without transmitting the rotation to the rotary drive body.   2. The movable body according to claim 1, wherein the movable body is fixed to a shaft body rotatably supported by the apparatus, and a one-way clutch is disposed between the shaft body and the rotary drive body. Braking device.   A second one-way clutch is disposed between the rotary drive body and the drive source that transmits rotation to the rotary drive body when the drive source rotates and does not transmit rotation to the drive source when the rotary drive body rotates. The braking device for a movable body according to claim 1, wherein the braking device is movable.   The direction in which the movable body rotates the rotary drive body via a one-way clutch is the same as the direction in which the drive source rotates the rotary drive body via a second one-way clutch. 4. The movable body braking device according to any one of 3 above. A braking device for a movable body according to any one of claims 2 to 4, comprising:
The rotation driving body and the driven rotation body are driving members built in the fixing device,
The image forming apparatus, wherein the movable body is a door member that is disposed in the apparatus and rotates to open and close the opening of the apparatus.   6. The image forming apparatus according to claim 5, wherein the rotary driving body is a heating roller of a fixing device, and the driven rotary body is a pressure roller of the fixing device.   The image forming apparatus according to claim 5, wherein the rotation driving body is a rotation member of an endless belt device including a heater therein.   The image forming apparatus according to claim 5, wherein the door member includes a lock member that engages with the apparatus housing when the opening of the apparatus housing is closed.   The image forming apparatus according to claim 5, wherein the braking force applied to the door member by the rotary driving body overcomes a moment applied to the door member by gravity. The rotary drive is fixedly attached to the device,
The image forming apparatus according to claim 5, wherein the driven rotating body is movably disposed in an apparatus housing and is in pressure contact with the rotation driving body.   An image bearing member, a latent image forming device that writes an electrostatic latent image on the image bearing member, and a developing device, and the latent image forming device is disposed on the back side of a door member that opens and closes an opening for removing the developing device. The image forming apparatus according to claim 5, wherein the image forming apparatus is an image forming apparatus.