JPH06345288A - Sheet carrying device and recording device - Google Patents

Abstract

PURPOSE:To remove a jammed sheet material in simple constitution without enlarging the device by providing a push-up means lifting the sheet material from a platen face interlocking with a release means releasing pinched holding of the sheet material by means of a pair of carrying rollers. CONSTITUTION:For disposal of jamming, by rotating a camshaft 15 by means of a lug part, pinch rollers 6b, 8b are respectively pushed upward by means of a releasing cam 13, and the pinch rollers 6b, 8b are separated from drive rollers 6a, 8a so as to release pushing pressure. Meanwhile, a push-up cam 14 pushes down the engaging part 17b of a push-up member 17, and hence the push-up part 17a is upward projected through the hole part 7a provided on a platen 7. At this time a recording sheet 3 jammed on the platen face is not pinchedly held with the pinch rollers 6b, 8b, so as to form a large loop. Consequently, disposal of jamming can be easily performed, by pinching the loop part with fingers and drawing it out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet material conveying mechanism, and more particularly to a sheet conveying apparatus which can easily remove jams (paper jams) and a recording apparatus using the sheet conveying apparatus.

[0002]

2. Description of the Related Art Conventionally, a sheet conveying apparatus used in a recording apparatus has a conveying roller pair composed of a driving roller and a pinch roller which is in pressure contact with the driving roller and is arranged on the upstream side and the downstream side of a platen. Nip and convey sheet materials. In such an apparatus, it is general to provide a mechanism for releasing the pressing of the pair of transport rollers so that the sheet material can be easily removed when the sheet material is jammed.

[0003]

However, depending on the position where the sheet material is jammed, the sheet material may not be easily taken out only by releasing the pressing of the pair of conveying rollers. Therefore, a device has been proposed in which the pressing of the pair of conveying rollers is released by the lever operation during the jam processing, the guide plate for guiding the conveyance of the sheet material is retracted, and the sheet conveying path is largely opened. According to this, the jammed sheet can be easily removed regardless of the position where the sheet material is jammed.

However, in order to largely open the sheet conveying path as described above, there are problems that the structure becomes complicated and many parts are required, the apparatus becomes large and the cost increases. there were.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a sheet conveying apparatus which can easily carry out jam processing with a simple structure without increasing the size of the apparatus and a sheet conveying apparatus for using the same. To provide the recording device that was used.

[0006]

A typical configuration according to the present invention for achieving the above object is a pair of conveying rollers for nipping and conveying a sheet material, and a platen for supporting the back surface of the sheet material. A sheet conveying device is provided with a releasing means for releasing the nipping of the sheet material by the pair of conveying rollers, and a pushing-up means for interlocking with the releasing means and lifting the sheet material from the platen surface, This is characterized in that a recording device is configured using this.

[0007]

In the above structure, when the releasing means is operated to release the pressing of the pair of conveying rollers, the pressing means interlocks with this and lifts the sheet material from the platen surface. For this reason,
The jammed sheet material can be easily removed.

[0008]

【Example】

First Embodiment Next, a first embodiment according to the present invention will be specifically described with reference to FIGS. 1 to 5. Incidentally, FIG. 1 is a schematic explanatory view of the overall configuration of a recording apparatus using the sheet conveying apparatus according to the present invention, and FIGS. 2 to 5 are configuration explanatory views of a roller pair pressing releasing means and a sheet material lifting means.

In FIG. 1, a cassette 2 is attachable / detachable to / from the recording apparatus main body 1, and a plurality of recording sheets 3 stacked and accommodated in the cassette 2 are separated from each other by a half-moon-shaped pickup roller 4. Supplied, up and down guide 5
a, 5b. still,
The pick-up roller 4 stops in the state shown in FIG. 1 after one rotation and loses the sheet conveying force. Before that, the leading edge of the sheet is driven and rotated by a motor (not shown) and a driving roller by a pressure means (not shown). It is nipped and conveyed by a pair of conveying rollers 6 composed of pinch rollers 6b pressed by 6a.

The recording sheet 3 conveyed by the conveying roller pair 6 has its back surface supported by a platen 7, and the leading edge of the sheet is sandwiched by a conveying roller pair 8 provided downstream of the platen 7 to perform predetermined recording. Be seen. The transport roller pair 8 also includes a drive roller 8a that is driven and rotated by a motor (not shown) and a pinch roller 8b that is pressed by the drive roller 8a by a pressure means (not shown).

In this embodiment, a serial type recording system is used as the recording means, a recording head 11 is mounted on a carriage 10 which can reciprocate along a guide rail 9 provided in the front and back direction of the paper, and the carriage 10 is scanned. At the same time, the recording head 11 is driven according to a recording signal to perform one-line recording, then the recording sheet 3 is conveyed by a predetermined amount, the carriage 10 is scanned again, and the recording operation is repeated. The recorded sheet 3 is discharged to the discharge tray 12 by the pair 8.

In this embodiment, an ink jet recording method is used as a recording method, in which ink is ejected from a recording head for recording. That is, this recording head has a fine liquid discharge port (orifice), a liquid passage and an energy acting portion provided in a part of this liquid passage, and energy generation for generating droplet forming energy for acting on the liquid in the acting portion. Equipped with means.

As an energy generating means for generating such energy, a recording method using an electromechanical transducer such as a piezo element, electromagnetic waves such as a laser are irradiated to generate heat, and droplets are ejected by the action of the heat generation. There are a recording method using an energy generating means, a recording method using an energy generating means for heating a liquid and discharging the liquid by an electrothermal converter such as a heating element having a heating resistor.

Among them, a recording head used in an ink jet recording method for ejecting a liquid by thermal energy has a high density of liquid ejection ports (orifices) for ejecting recording liquid droplets to form ejection liquid droplets. Since they can be arranged, high resolution recording is possible. Among them, the recording head using the electrothermal converter as the energy generating means can easily be made compact, and has the advantages of the IC technology and the microfabrication technology, which have been remarkably improved in technology and reliability in the recent semiconductor field. This is advantageous because it can be used in two parts, high-density mounting is easy, and the manufacturing cost is low.

In the recording apparatus of the present embodiment, the pressing release means of the pair of conveying rollers 6 and 8 is provided so that the processing when the recording sheet 3 is jammed can be easily performed, and the recording sheet 3 is placed on the platen 7. A push-up means is provided for lifting from above. Next, the configuration will be described with reference to FIGS.

2 and 3 are sectional views taken along the line AA of FIG. 1. FIG. 2 shows a normal recording state, and FIG. 3 shows a jam processing state. 4 and 5 are sectional views in the same direction as in FIG. 1, and FIG. 4 shows a state during normal recording, and FIG.
Is the state at the time of jam processing.

Rotating shafts 6b1 and 8 of the pinch rollers 6b and 8b
The b1 is attached to the apparatus body 1 so as to be movable up and down, and is urged downward by a spring (not shown) or the like to press against the drive rollers 6a and 8a. And the rotary shaft 6b
Below 1,8b1, there is a release cam 13 as a pressure release means.
It is provided coaxially with the push-up cam 14, and the cams 13 and 14 are attached so as to be rotatable around a shaft 15. A knob portion 16 is provided at one end of the shaft 15, as shown in FIG.

A push-up member 17 as push-up means is rotatably attached below the platen 7 about a shaft 18, and is turned by a push-up cam 14 provided coaxially with the release cam 13. Is provided.

During normal recording, as shown in FIGS. 2 and 4, the cams 13 and 14 are in positions where they do not come into contact with other members. At this time, the pinch rollers 6b and 8b are driven rollers 6a and 8a, respectively. The recording sheet 3 can be nipped and conveyed by pressing. On the other hand, the push-up member 17 has its push-up portion 17a pulled downward by a tension spring 19, and the push-up portion 17a is located below the surface of the platen 7.

At the time of jam clearance, as shown in FIGS. 3 and 5, when the cam shaft 15 is rotated by the knob portion 16, the releasing cam 13 pushes up the pinch roller shafts 6b1 and 8b1 respectively, and the pinch roller shafts 6b1 and 8b1 are pushed upward. 6b and 8b are separated from the drive rollers 6a and 8a to release the pressure. On the other hand, the push-up cam 14 has a push-up portion 17a protruding upward from a hole 7a provided in the platen 7 in order to push down the engaging portion 17b of the push-up member 17. At this time, since the recording sheet 3 jammed on the platen surface is not sandwiched by the pair of conveying rollers 6 and 8, a large loop is formed as shown in FIG. Therefore, jamming can be easily performed by pulling out the loop portion with fingers.

After the jam processing, when the knob portion 16 is returned to the original position, the push-up member 17 is returned to the original position by the biasing force of the tension spring 19, and the pinch rollers 6b and 8b are also driven by the biasing force of the pressing spring (not shown). The rollers 6a and 8a are pressed.

As described above, the jam processing can be easily performed with the simple structure. If the recording sheet 3 is jammed before reaching the conveying roller pair 6 or if the leading edge of the recording sheet is slightly touching the conveying roller pair 6, the cassette 2 shown in FIG. Just take out.

[Second Embodiment] In the first embodiment described above, an example is shown in which the recording sheet jammed by the push-up member 17 is lifted from the platen surface, but as the second embodiment, the platen itself can be displaced. An example will be described with reference to FIGS. 6 and 7. 6. FIG. 6 is an explanatory diagram of the state during recording, and FIG. 7 is an explanatory diagram of the state during jam processing.

In this embodiment, the platen 20 is attached so as to be rotatable around the shaft 21, and as shown in FIG. 6, the tension spring 22 biases the stopper in the recording state.
It is fixed in contact with 23.

During the jam clearance, as shown in FIG. 7, when the cam shaft 15 is rotated as in the first embodiment, the release cam 13 pushes up the pinch rollers 6b and 8b (not shown in FIG. 7) upward. Then, the pressing of the pair of conveying rollers 6 and 8 (not shown in FIG. 7) is released. At the same time, the push-up cam 24 attached to the cam shaft 15 pushes down one end of the platen 20, and the platen 20 rotates counterclockwise around the shaft 21. This allows
Since the jammed recording sheet 3 is lifted on the platen 20 to form a large loop, the jammed recording sheet can be easily removed as in the first embodiment.

If the platen 20 is rotated in this way, the push-up member is not required as in the first embodiment, and the number of parts can be reduced to further reduce the cost.

[Other Embodiments] In the above-mentioned embodiments, the ink jet recording system is used as the recording means, but the electrothermal converter is energized according to a recording signal, and the thermal energy applied by the electrothermal converter is changed. It is more preferable that the recording is performed by ejecting the ink from the ejection port due to the growth and contraction of the bubbles generated in the ink by utilizing the film boiling generated in the ink.

With regard to its typical structure and principle, it is preferable to use the basic principle disclosed in, for example, US Pat. Nos. 4,723,129 and 4740796. This method can be applied to both the so-called on-demand type and continuous type, but in the case of the on-demand type in particular, it is arranged corresponding to the sheet or liquid path holding the liquid (ink). By applying at least one drive signal to the electrothermal transducer, which corresponds to the recorded information and gives a rapid temperature rise beyond nucleate boiling,
This is effective because heat energy is generated in the electrothermal converter to cause film boiling on the heat acting surface of the recording head, and as a result, bubbles in the liquid can be formed in a one-to-one correspondence with this drive signal. Due to the growth and contraction of the bubbles, the liquid is ejected through the ejection openings to form at least one droplet. It is more preferable to make this drive signal into a pulse shape because bubbles can be grown and contracted immediately and appropriately, so that particularly excellent liquid ejection can be achieved.

As the pulse-shaped drive signal, those described in US Pat. Nos. 4,463,359 and 4,345,262 are suitable.

Further excellent recording can be performed by adopting the conditions described in US Pat. No. 4,313,124, which is an invention relating to the rate of temperature rise on the heat acting surface.

As the constitution of the recording head, in addition to the combination constitution of the discharge port, the liquid passage, and the electrothermal converter (the linear liquid passage or the right-angled liquid passage) as disclosed in the above-mentioned respective specifications. The present invention also includes configurations using US Pat. Nos. 4,558,333 and 4,459,600, which disclose configurations in which the heat acting portion is arranged in a bending region.

Further, Japanese Unexamined Patent Publication No. 59-123670 discloses a structure in which a common slit is used as a discharge part of the electrothermal converter for a plurality of electrothermal converters, and an opening for absorbing a pressure wave of thermal energy. Japanese Patent Laid-Open Publication No.
The effect of the present invention is effective even if the configuration is based on Japanese Patent Laid-Open No. 59-138461. That is, according to the present invention, recording can be surely and efficiently performed regardless of the form of the recording head.

Further, the present invention can be effectively applied to a full line type recording head having a length corresponding to the maximum width of a recording medium which can be recorded by the recording apparatus. Such a recording head may have a structure that satisfies the length by combining a plurality of recording heads or a structure as one recording head integrally formed.

In addition, even in the case of the serial type described above, when the recording head is fixed to the carriage or mounted on the carriage, it is possible to electrically connect to the apparatus main body and supply ink from the apparatus main body. A replaceable chip type recording head or a cartridge type recording head in which an ink tank is integrally provided in the recording head itself may be used.

Further, it is preferable to add a recovery means for the recording head, a preliminary auxiliary means, etc., which are provided as a constitution of the recording apparatus of the present invention, because the effects of the present invention can be further stabilized. Specifically, these are capping means, cleaning means, pressurizing or suctioning means for the recording head, preheating means by electrothermal conversion type or other heating element or a combination thereof, and recording. It is also effective to perform a stable recording by performing a preliminary discharge mode in which another discharge is performed.

Regarding the type or number of recording heads mounted on the carriage, for example, only one recording head is provided corresponding to a single color ink, or a plurality of inks having different recording colors and densities are supported. And a plurality of them may be provided. That is, for example, the recording mode of the recording apparatus is not limited to a recording mode of only the mainstream color such as black, but may be a combination of a plurality of recording heads integrally formed, but a mixed color of different colors or a mixed color It is also applicable to a device with at least one of the full colors according to

In addition, although the ink is explained as a liquid in the above-mentioned embodiments, it is an ink which is solidified at room temperature or lower and softens or liquefies at room temperature, or in the ink jet recording system. 30 inks
Generally, the temperature is controlled in the range of ℃ to 70 ℃ to control the temperature of the ink so that the viscosity of the ink is within the stable ejection range. good. In addition, it is possible to prevent the temperature rise due to thermal energy from being positively used as the energy for changing the state of the ink from the solid state to the liquid state, or to use ink that solidifies when left standing for the purpose of preventing ink evaporation. However, in any case, when heat ink is liquefied by applying heat energy according to the recording signal and liquid ink is ejected, or when the ink reaches the recording sheet, it begins to solidify. It is also applicable when using an ink that has the property of being liquefied for the first time by energy.

The ink in such a case is disclosed in JP-A-54-5.
As described in Japanese Patent No. 6847 or Japanese Patent Laid-Open No. 60-71260, a mode in which it is opposed to the electrothermal converter in a state of being held as a liquid or a solid in the concave portion or through hole of the porous sheet. Also good. The most effective one for each of the above-mentioned inks is to execute the above-mentioned film boiling method.

Further, as a form of the above-mentioned ink jet recording apparatus, besides the one used as an image output terminal of an information processing apparatus such as a computer, a copying apparatus combined with a reader or the like, and further a facsimile apparatus having a transmitting / receiving function. It may take a form or the like.

Although an example of using the ink jet recording method as the above-mentioned recording means has been described, the present invention does not need to be limited to the ink jet recording method, and other thermal transfer recording method, heat sensitive recording method, Can also be applied to an impact recording method such as a wire dot recording method or another recording method. Further, it is not necessary to limit to the serial recording method, and a so-called line recording method may be used.

[0041]

As described above, according to the present invention, since the releasing means is operated to release the pressing of the pair of conveying rollers, and in conjunction with this, the lifting means lifts the sheet material from the platen surface, so that the jam is prevented. The removed sheet material can be easily removed. Further, since the structure is simple, there is an effect that the device is not enlarged and the cost is not increased.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram of the overall configuration of a recording apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory view of states of a releasing means and a pushing-up means during normal recording.

FIG. 3 is an explanatory view of states of a releasing unit and a pushing-up unit during a jam process.

FIG. 4 is an explanatory diagram of states of a releasing means and a pushing-up means during normal recording.

FIG. 5 is an explanatory view of states of a releasing unit and a pushing-up unit during a jam process.

FIG. 6 is a state explanatory view of a releasing means and a pushing-up means at the time of normal recording according to another embodiment.

FIG. 7 is a state explanatory view of a releasing means and a pushing-up means at the time of jam handling according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Device body 2 ... Cassette 3 ... Recording sheet 4 ... Pickup roller 5a, 5b ... Guide 6 ... Conveying roller pair 6a ... Driving roller 6b ... Pinch roller 6b1 ... Rotating shaft 7 ... Platen 8 ... Conveying roller pair 8a ... Driving roller 8b Pinch roller 8b1 Rotation shaft 9 Guide rail 10 Carriage 11 Recording head 12 Ejection tray 13 Release cam 14 Push up cam 15 Shaft 16 Knob 17 Push up member 17a Push up 17b Engagement 18 ... Shaft 19 ... Tension spring 20 ... Platen 21 ... Shaft 22 ... Tension spring 23 ... Stopper 24 ... Push-up cam

Claims (7)

[Claims] 1. A pair of conveying rollers for nipping and conveying a sheet material, a platen for supporting the back surface of the sheet material, a releasing means for releasing the nipping of the sheet material by the pair of conveying rollers, and the releasing. A sheet conveying device, comprising: a pushing-up unit for interlocking with the unit to lift the sheet material from the platen surface. 2. The push-up means is configured such that a push-up member can project from the platen surface.
The sheet conveying device described. 3. The sheet conveying apparatus according to claim 1, wherein the push-up means is configured to displace the platen. 4. A pair of conveying rollers for nipping and conveying the sheet material, and a platen for supporting the back surface of the sheet material,
A sheet conveying means having a releasing means for releasing the nipping of the sheet material by the conveying roller pair, and a lifting means for interlocking with the releasing means and lifting the sheet material from the platen surface; A recording device for recording on a sheet material conveyed by the recording device. 5. The recording apparatus according to claim 4, wherein the recording apparatus is an inkjet recording system in which recording means ejects ink in response to a signal to perform recording. 6. The recording apparatus according to claim 5, wherein the recording apparatus includes an electrothermal converter for the recording unit to generate thermal energy for ejecting ink. 7. The recording apparatus according to claim 6, wherein the recording unit causes the ink to be ejected from the ejection port by utilizing the film boiling generated in the ink by the thermal energy applied by the electrothermal converter. The recording device described.