JPH11292341A - Recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily carry a driving roller, and to perform high quality image processing by forming the driving roller in a thin hollow shaft shape, and forming a driven roller of aluminum. SOLUTION: A driving roller 6 is formed of a pipe-shaped thin hollow shaft by applying urethane painting to the outer periphery for reducing weight. The driving roller 6 is revolvingly driven by a sheet feeding motor through an LF gear. A driven roller 7 held by a pinch roller holder 9 rotatably installed on a platen 14 is brought into pressure contact from below with the driving roller 6 by a spring, so that a sheet sandwiched between the driving roller 6 and the driven roller 7 is carried by driving of the sheet feeding motor. Since the driving roller 6 is lightweight and is small in a rotary load by forming a construction material of aluminum being light metal, a sheet carrying loss is hardly caused. Allogine treatment is applied to both the outer peripheral part and the shaft part of the driven roller 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small and lightweight portable recording device.

[0002]

2. Description of the Related Art Recording devices such as printers, copiers and facsimile machines, or recording devices used as output devices for composite electronic devices and workstations having a computer, word processor, etc., are based on image information such as paper or plastic thin plates. The image is recorded on the sheet. These recording apparatuses can be classified into an ink jet type, a wire dot type, a thermal type, a laser beam type, and the like according to a recording method.

Further, with the downsizing of word processors and personal computers, recording devices such as printers, copiers, and facsimile devices, which are output devices, also tend to be downsized. In particular, a portable personal computer or the like called a notebook type usually does not include a recording device, and a portable recording device is required to record information on the go. . For this reason, portable recording devices are required to be small, lightweight and battery-driven.

[0004] The recording apparatus has a sheet conveying apparatus for conveying a sheet. This sheet conveying device converts a sheet into a driving roller (LF roller) and a driven roller (pinch roller).
And convey it. The drive rollers include
A solid round bar roller is used. As the driven roller, a roller made of steel or stainless steel, or a roller formed by molding is used.

[0005]

However, a solid round bar-shaped roller is used as a driving roller of a conventional sheet conveying apparatus. For this reason, the recording device has a problem that it is heavy and unsuitable for carrying.

Further, if the driving roller of the sheet conveying device is heavy, the recording device cannot smoothly convey the sheet in cooperation with the driven roller, and the accuracy of conveying the sheet is reduced, so that a high quality image can be obtained. There is also a problem that it cannot be formed.

Further, if the driving roller is heavy, the case is likely to be damaged when the recording device is dropped by passing. For this reason,
The case must have a strong structure, and the recording device
There is a problem that it is more difficult to carry.

[0008] It is an object of the present invention to provide a recording apparatus capable of carrying out high quality image processing by improving the conveyance accuracy of a sheet while reducing the weight of a driving roller so as to be easily carried. And

[0009]

The above object is achieved by the following recording apparatus.

A recording device weighing about 1 kg or less and conveying a sheet between a driving roller and a driven roller, wherein the driving roller is formed in a thin hollow shaft shape, and the driven roller is made of aluminum. It is characterized by being.

The ratio between the outer diameter and the thickness of the driving roller is set to about 6: 1.

The driving roller has an outer diameter of about 6 mm to about 8 mm.
mm and the thickness is set to about 1 mm to about 1.5 mm.

An upper and lower case which are separable by accommodating the driving and driven rollers; one ends of the upper and lower cases are engaged by an engaging portion and an engaged portion which can be disengaged from each other; An end is connected by a screw, and a projection is provided on one of the upper and lower case facing surfaces at an intermediate position between the engaging portion and the engaged and the screw.

[Operation] Since the drive roller is formed in a thin hollow shaft shape, it is lightweight. The driven roller is also lightweight because it is made of aluminum. For this reason, the rotational load of the driving and driven rollers is reduced, and the driving and driven rollers smoothly feed the sheet with almost no sheet conveyance loss.

The driving roller is a thin hollow shaft having an outer diameter of about 6 mm to 8 mm and a wall pressure of about 1 mm to 1.5 mm and a ratio of outer diameter to wall thickness of about 6: 1. For this reason, it is possible to prevent the drive roller from being bent or wobbled due to hollowing, and to improve the roundness, thereby improving the sheet conveyance accuracy.

A recording apparatus having such a driving and driven roller smoothly conveys a sheet and forms an image with high quality.

When the screws are tightened in the upper and lower cases, the other ends of the upper and lower cases approach each other, and the "lever principle"
Thus, one end of the upper case and the one end of the lower case are separated from each other with the protrusion as a fulcrum. However, the one ends cannot be separated because they are engaged with each other by the engaging portion and the engaged portion. Rather, the tighter the screw, the more secure the engagement, and the upper and lower cases are reliably integrated.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of an ink jet recording apparatus according to an embodiment of the present invention. FIG. 2 is a perspective view of the recording apparatus of FIG. FIG. 8 is a perspective view of the recording apparatus in use. 1 and 2, an upper case 100 that covers the upper surface of the recording device and a lower case 100 that covers the lower surface of the recording device are divided by a paper path.

A method of assembling the upper case 100 and the lower case 101 will be described with reference to FIGS.

The upper case 100 is provided with claws 100b, and the corresponding lower case 101 is provided with hook portions 101b. Usually, the nail 100b and the hook 101
A gap 124 is provided in b. This gap 124
Is usually provided in the order of 0.2 to 0.5 mm in consideration of variation in component dimensions and assembly error. Also, a projection 101a is provided on the joint surface of the lower case 101 with the upper case 100.
Is provided. Claw part 100b and hook part 101b
And tightened with screws 123, the upper case 100 is slightly rotated about the protrusion 101a in the direction of the arrow in the figure, and is integrated with the lower case 101. The gap 124 is reduced by this rotating operation, and the gap is eliminated when the screw 123 is tightened.

The rotation by the convex portion 101a eliminates a gap, eliminates backlash between the upper case 100 and the lower case 101, improves rigidity, and eliminates so-called chattering caused by vibrations caused by the printing operation of the recording apparatus. Usually, the number of parts is reduced as compared with a case where the four corners of the lower case 101 are fixed with four screws, so that the number of work steps is reduced and the cost is reduced. As a result, a space for screws is not required, which can contribute to downsizing of the recording apparatus. The head replacement cover 102 is provided so as to cover the opening 100 c provided in the upper case 100.

The opening 100c is used to replace the recording head, to clear a paper jam inside the recording apparatus, to clear a jam, or to clean the inside of the recording apparatus.
It can be opened and opened as shown in the figure. The opening 100c is provided substantially at the center of the upper case 100 and at a portion where a part of a carrier scanning range described later is exposed. By forming the opening 100c in a part of the upper case 100, a decrease in rigidity of the upper case 100 can be minimized. In addition, since the upper portion of the recovery section, which will be described later, is always covered with the upper case 100, dust and the like can be prevented from adhering to the recovery section, and the carrier 2 moves to the recovery section in order to recover the head. In this case, there is also an effect that the user does not carelessly touch the head.

As shown in FIGS. 7 and 8, the head replacement explanation plate 104 is a 0.2 mm thick polyester sheet on which a method for replacing the head is printed. The reason why the head replacement explanation plate 104 is formed as a separate member from the head replacement lid 102 is that if printing is performed directly on the head replacement lid 102 or a printed matter is attached thereto, it becomes a foreign matter during recycling. The head replacement lid 102 has a first surface which is formed in a plate shape and which becomes outside when closed, and a second surface which faces the carrier operation unit. The head replacement explanation plate 104 is provided on the second surface of the head replacement lid 102. The head replacement cover 102 is provided with two hooks 102a opposed to each other, and holes 104a of the head replacement plate 104 are hooked and fixed to the hooks 102a. The head replacement explanation plate 104 and the head replacement lid 102
Step 2 is formed about 2 mm larger than the opening 100c of the upper case 100 and is provided in the opening 100c of the upper case 100.
00a. Therefore, the end of the head replacement explanation plate 104 is
When the cover 2 is closed, it is sandwiched between the head replacement cover 102 and the upper case, and the end is prevented from dropping and interfering with the carrier 2.

FIG. 8 shows how to attach the head replacement explanation plate 104. The head replacement cover 102 is formed of 2 mm polycarbonate plastic and is bent as shown in FIG. 8 so as to fit into the hole 104 a of the head replacement explanation plate 104. When the bending of the head replacement cover 102 is eliminated, the head replacement explanation plate 104 is attached by the hook 102a as shown in FIG. When sorting for recycling, it can be removed in the reverse way. 1, 2, and 9, a power lamp 110 is a lamp that indicates an on state of a power switch 106 that turns on and off the power of the recording apparatus.
The error lamp 109 is a lamp that indicates an error state of the recording apparatus, and is turned on when various failure states of the recording apparatus occur. Error release switch 107
Is a switch for releasing the error state of the recording device,
After the failure state of the recording apparatus is released, the error is released by pressing the recording apparatus. Hold switch 10
No. 5 has a function of disabling the power switch 106 so that the power is not turned on carelessly when the recording apparatus is carried.

A power connector 117 provided on the upper case 100 is a connector for supplying power to the recording apparatus. The interface connector 118 for connecting a signal cable from the host is covered with an interface connector cover 119. The interface connector cover 119 is formed of an elastic body, and one end is provided on the upper case 100 by a hinge portion 119a, and the other end is a free end. The hinge portion 119a is formed thinner than other portions, and is used by being opened and closed as a hinge of the interface connector cover 119. The material of the hinge portion 119a is a thermoplastic polyurethane having an excellent hardness of 85 (Shore A) with good tear resistance. In recent years, some notebook personal computers have an infrared communication function.
Is the interface connector 118 and the lower case 101
Are provided close to the same plane.

The sheet is inserted from a sheet supply port 121 and discharged from a sheet discharge port 122. The sheet supply tray 111 is in a closed state as shown in FIG. 2 when not in use, and guides the insertion of the sheet 22 in an open state as in FIG. 9 when in use. The sheet supply tray 111 is integrally provided with a left guide portion 111a which is a reference for inserting a sheet. The left reference position is the same regardless of the size of the paper. On the other hand, the right guide 112 that guides the right end of the sheet 22 is used by the user sliding according to the size of the sheet.

An optional connector 58 is provided on the surface of the sheet supply port 121. The optional connector 58 is used when the optional connector cover 126 is not used.
Covered by As an example of an optional recording apparatus, an automatic sheet feeding apparatus (ASF) 127 shown in FIG.
There is. The ASF 127 has an ASF connector 128 connected to the option connector 58. The recording device and the ASF 127 slide together in the direction of the arrow in FIG. At this time, since the direction of the sheet path and the merging direction are the same, a space for the discharged sheet is normally secured in the sheet discharging direction at the installation location of the ASF 127, so that the mounting is easy. For example, in a method of connecting from a direction orthogonal to the sheet path, ASF127
Space is required beside the space, and the installation place is limited.
In addition, since the direction of the sheet path and the uncoupling direction are the same, the processing is easy when the sheet is jammed. At the time of merging, since the optional connector 58 is provided on the same surface as the sheet supply port 121, the connection with the ASF connector 128 is performed at the same time without the user being conscious of the trouble. Can be prevented.

This recording apparatus has a built-in battery and is mainly intended to be used by carrying. Since the length of the palm is about 70 mm to 120 mm, a thickness of 60 mm or less is suitable for portability in consideration of ease of gripping. For this reason, the size of the recording apparatus is about 300 mm in width and about 1 mm in depth.
The size is set to be 10 mm and the thickness is about 50 mm so that it can be grasped by hand, thereby improving portability. Also,
The total weight of the recording apparatus is increased to about 900 g by means of weight reduction technology such as an aluminum pinch roller, a hollow paper feed roller, a hollow guide shaft, and a volume-efficient lithium-ion battery to improve portability. [Overall Internal Configuration] FIGS. 25 and 26 are perspective views showing the internal configuration of an embodiment of the recording apparatus of the present invention. In FIGS. 25 and 26, the platen 14 constitutes a recovery system unit, a lower portion of a paper feeding unit, and the like, which will be described later. The frame 4 made of an aluminum material for weight reduction holds a carrier operation unit and an upper portion of a paper feed unit, which will be described later, and constitutes a recording apparatus. The platen 14 and the frame 4 are positioned so that the bosses of the platen 14 and the cutouts of the frame 4 provided on the left and right side sheet discharge sides are fitted to each other, and are provided on the sheet supply side on the left and right side surfaces of the platen 14. The frame 4 is hooked on the claw portion and is fixed to each other. The substrate holder 113 shown in FIGS. 25 and 26 is positioned on the paper feed side of the frame 4 by two bosses (not shown), and fixed to three claws provided at the upper part and one screw at the lower central part. Have been. The board holder 113 has a function of detachably holding the battery 116, a function of holding the board 57, a function of guiding an upper path when feeding the sheet 22, and the like.

The function of holding the battery 116 of the substrate holder 113 will be described with reference to FIGS.
Substrate holder 1 on the left side when viewed from the sheet supply side of sheet 22
A battery contact 115 having four male terminals is held outside the wall of the thirteen by being soldered to a battery board (not shown). The male terminal side of the battery contact 115 is the substrate holder recess 1 in which the battery 116 is accommodated.
13b has jumped into. A battery cable 131 is connected from the battery board to the board 57 via a battery connector 132. On the opposing surface (right side), a substrate holder rail 113a provided in the substrate holder 113 and substantially parallel to the paper passing direction, and a battery hook 125 that slides in and out are provided. The battery hook 125 moves in and out in conjunction with the sliding operation of the battery lock lever 114. And battery hook 1
Reference numeral 25 is always urged by the battery lock spring so as to come out.

As shown in FIG. 28, a battery step 116a is provided at the end of the battery 116 in correspondence with the substrate holder recess 113b of the substrate holder 113.
A battery contact knife 116b is provided at a position where the battery contact knife 116b is connected to the battery contact 115. On the opposite end, the substrate holder rail 11
There is a battery recess 116d at a position corresponding to the battery groove 116c and the battery hook 125 at a position corresponding to 3a.

With such a configuration, the battery step 116a of the battery 116 is inserted into the substrate holder recess 113b of the substrate holder 113. Then, the battery contact 115 is brought into contact with the battery contact scalpel 116b, and the battery 116 is rotated in the direction of arrow A in FIG. 27 and rotated until it comes into contact with the substrate holder rail 113a at the opposite end while being inserted into the battery groove 116c. , The battery hook 125 is moved by the spring force of the battery lock spring.
d. In addition, the battery pop-up 60 is located on the back side of the substrate holder 113 where the battery 116
Is pushed by a battery pop-up spring 61 in a direction to push out. Accordingly, when the battery lock lever 114 is slid against the force of the battery lock spring, the battery hook 125 is interlocked, the battery hook 125 is disengaged from the battery recess 116d, and the battery pop-up 60 is moved by the force of the battery pop-up spring 61 in FIG. It jumps out in the direction of arrow C and pushes out battery-116 by its force. Then, the battery-116 moves around the contact point between the battery contact 115 and the battery contact female 116b as indicated by an arrow B in FIG.
In the direction, the battery-116 comes off.

Referring to FIG. 28 and FIG.
This will be briefly described with reference to FIG. The battery 116 has battery cells (not shown) arranged in series inside and is covered by welding. Further, a battery rib 116e is provided at an upper front portion of the battery 116 at a front width, and serves to prevent dust from entering when the sheet feeding tray 111 is closed. The central portion of the battery rib 116e is slightly lowered in an arc shape in the lower direction, so that the battery rib 116e is prevented from being caught by a finger when opening the paper feed tray 111.

Next, the function of the recording apparatus when feeding the sheet 22 will be described. As shown in FIG. 4, when viewed from the sheet supply side of the sheet 22, the substrate holder 113 and the battery 116 have an arc-shaped lower front portion, which facilitates sheet supply. Further, a supply path of the sheet 22 is formed by a platen 14 at a lower part and a substrate holder 113 and a battery 116 at an upper part, and also serves as a guide of the sheet supply path.

Further, the substrate holder 113 is provided with substrate holder bosses 113c at the upper left and right sides in front of the sheet supply side, and the substrate holder boss 113c is inserted into the hole of the substrate 57, and serves for positioning and supporting the substrate 57. Has become. The back side of the substrate 57 is fixed to the frame 4 by two screws on the left and right. From this part, the board 57 is grounded. Other, optional connector 58
Are fixed to the substrate holder 113 with two screws.

Further, as shown in FIG. 4, the paper sensor 25 is held below the substrate holder 113, that is, on the side where the sheet 22 passes. Further, a secondary coin battery (not shown) for holding a memory is accommodated in a portion surrounded by the substrate holder 113. In addition, a substrate holder hole 113d is provided on the left side and a substrate holder long hole 113e is provided on the right side of the substrate holder 113 on the front side of the sheet supply.
It is a positioning portion of F127.

Here, the shield plate 56 will be described with reference to FIG. The shield plate 56 is composed of a shield plate aluminum foil 56b having conductivity at an upper portion and a shield plate PET 56a having insulation at a lower portion. Aluminum foil 5
6b and PET 56a are bonded by a shield plate bonding layer 56c. The shield plate 56 is fixed to the frame 4 at two places with screws, and the upper shield plate aluminum foil 56b and the screw are in contact with each other to establish conduction with the frame 4. The frame 4 is electrically connected to a ground (not shown). As described above, the shield plate 56 covers the upper surface of the substrate 57, and has an effect of shielding radiation noise generated from the substrate 57. In a low-humidity environment, static electricity may be accumulated in the user's body, and the recording device may be discharged in the air when the recording device is operated. This voltage sometimes reaches 40 kV, and if the voltage is discharged to the pattern of the substrate 57, the elements on the substrate 57 may be destroyed or malfunction. Even in such a case, since the substrate 57 is covered with the shield plate 56, static electricity flows to the ground through the aluminum foil 56b, and the substrate 57 is protected.

The thickness of the members constituting the shield plate 57 is
The shield plate aluminum foil 56b is about 50 μm, the shield plate PET 56a is about 100 μm, and the shield plate adhesive layer 56c is about 40 μm. This thickness is set by the following. If the shield plate aluminum foil 56b is thinner than this, it will be difficult to handle in production and wrinkles will occur. If the shield plate PET56a is thinner than this, it will be wrinkled when fixed to the frame 4 with screws. The shield plate 56 uses a self-extinguishing flame-retardant material.

Upper case 100, power switch 106, error release switch 107, shield plate 56 and substrate 57
A configuration showing the arrangement will be described with reference to a cross-sectional view of FIG. Upper case 1
The power switch 106 and the error release switch 107 are elastically attached so that the operation surface protrudes from the hole 100d. Immediately below the power switch 106 and the error release switch 107, a tact switch 57b is provided on the substrate 57 via the shield plate 56. Therefore, the tact switch 57 b corresponding to the power switch 106 and the tact switch 57 b corresponding to the error release switch 107 disposed on the substrate 57 are pressed via the shield plate 56. Similarly, the tact switch corresponding to the head exchange switch (not shown in FIG. 24) is also pressed via the shield plate 56. The hole 100
d denotes the power switch 106 and the error release switch 10
7 is formed with a gap of about 0.2 mm so as not to cause dimensional interference. Therefore, when the charged user attempts to press the switch, the static electricity is discharged as indicated by reference numeral 63 through the gap between the hole 100d of the upper case and the power switch 106 or the error release switch 107. Since the shield plate 56 is grounded, static electricity flows to the ground, and elements and patterns on the substrate 57 are protected. [Carrier Scanning Unit] As shown in FIG. 3, the recording apparatus includes a carrier 2 for detachably holding the recording head cartridge 1. The carrier 2 is orthogonal to the conveying direction of the sheet 22 on the guide shaft 5 and the guide rail 12 which are fixed to the frame 4 at both ends and arranged in parallel with each other,
The sheet 22 is slidably supported in the main scanning direction parallel to the surface of the sheet 22. The guide shaft 5 is a pipe-shaped thin hollow shaft. A lock arm 370 and a plug 5 a having a groove for fixing the guide shaft 5 to the frame 4 are fixed inside one end of the guide shaft 5.

The carrier 2 is not shown so as to be slidable and rotatable in a direction parallel to the guide shaft 5 and a driving pulley 13 which is rotated by a carrier motor 10 fixed to the frame 4. The belt 11 is connected to a part of the belt 11 looped between the idle pulley 27 supported by the frame 4 via a spring, and the belt 11 is driven by driving the carrier motor 10.
The carrier 2 reciprocates in the above-described direction along the guide shaft 5 and the guide rail 12.

Further, the recording head cartridge 1 is provided with an ink tank 8 which is detachably mounted, and when ink runs out by recording, the ink tank 8 is replaced so that the next recording can be performed. Has become. Further, the recording apparatus detects the passage of the carrier 2 to provide a home position sensor 26 (not shown) for detecting the position of the carrier 2 and a flexible cable 3 for transmitting an electric signal from the substrate 57 to the recording head cartridge 1. Have. [Sheet Feeding Unit] Next, a configuration for conveying the sheet 22 will be described with reference to FIGS. 3, 4, 55, and 56. FIG. A sheet feed roller 6 is rotatably supported by the frame 4, and an LF gear 18 is fixed to a shaft end of the paper feed roller 6. This sheet feed roller 6 is made
It is made of a pipe-shaped thin hollow shaft with urethane coating on the outer periphery. As shown in FIG. 54, the shape of this pipe has an outer diameter D2５６φ7.561 mm and an inner diameter d2 ≒ φ5 m
m and the pipe thickness t ≒ 1.28 mm. The sheet feed roller 6 is driven to rotate by a sheet feed motor 23 via an LF gear 18.

The above dimensions are set in consideration of the run-out accuracy and the perimeter tolerance in manufacturing, and the weight reduction and the problem of the strength of the frame 4 when dropped.

That is, the outer shape D2 of the sheet feed roller 6
Is set for the following reasons.

(1) LF motor gear 30 in a gear train between the sheet feed motor 23 and the sheet feed roller 6;
The reduction ratio of the LF double gear 31 and the LF gear 18 is set to be 1: 7.

(2) The rotation angle of the LF motor gear 30 when the sheet feed motor 23 is rotated by one step is about 7.5 degrees.

(3) Sheet 22 and sheet feed roller 6
There is some slip between them.

Therefore, in consideration of the above (1), (2) and (3), when the sheet feed motor 23 is rotated by one step, the sheet 22 is moved by the sheet feed roller 6 (1/360).
If the feed is performed in inches, the outer shape is set to D2.

In order to reduce the weight of the sheet feed roller 6 having the outer shape D2 as much as possible and to maintain the strength of the frame 4 at the time of dropping, the thickness of the pipe must be reduced. On the other hand, if the pipe 22 is manufactured so that the deflection due to the deflection accuracy of the sheet feed roller 6 and the pinch pressure applied to the four pinch rollers 7 does not affect the sheet feed accuracy of the sheet 22, the thickness of the pipe is large. The more stable. When these two conditions are balanced, the wall thickness of the pipe is determined, and the inner diameter d2 is also determined.

FIG. 4 is a sectional view of the recording apparatus.

The lower side of the sheet conveying surface mainly includes the platen 1
4. The platen 14 is incorporated along the inner wall of the lower case 101, and forms a box structure having a gap for accommodating a waste ink absorber 327 described later with the lower case 101. By screwing the platen 14 and the lower case 101 in this state, the warpage of the component alone is corrected, and the rigidity of the recording apparatus is improved. A plurality of protruding ribs (not shown) are formed on the surface of the platen 14 along the conveyance direction of the sheet 22 to reduce sticking of the sheet 22 due to static electricity and a sliding load during conveyance. Pinch roller 7 held by pinch roller holder 9 rotatably mounted on platen 14
Is pressed against the paper feed roller 6 from below by a spring (not shown), and the sheet sandwiched between the sheet feed roller 6 and the pinch roller 7 is moved by the sheet feed motor 2.
3 is driven.

As shown in FIG. 54, the pinch roller 7
Whether the diameter of the outer peripheral portion D1 for holding the sheet 22 between the sheet feeding roller 6 and the sheet feeding roller 6 is almost the same,
Alternatively, it is slightly smaller and has an outer diameter of about φ6 mm. Also, the ratio of the outer diameter d1 of the rotating shaft portion 7a held by the pinch roller holder 9 to the diameter D1 of the outer peripheral portion of the pinch roller 7 is 2:15, and the shaft diameter d1 is φ0.8 mm.
It has become. Further, the material of the sheet feed roller 6 is
It is made of aluminum, a light metal. For this reason, since the sheet feed roller 6 is lightweight and has a small rotational load, there is almost no loss in conveying the sheet. Since the outer diameter D1 of the pinch roller 7 and the outer diameter D2 of the sheet feed roller 6 are almost the same, the sheet 22 is supplied to the contact (nip) 33 between the pinch roller 7 and the paper feed roller 6 when feeding the sheet.
Is easy to guide. Further, it is possible to reduce the force of pushing the leading end of the sheet into the nip 33.

A pinch roller 7 made of aluminum
Both the outer periphery and the shaft are subjected to an allodyne treatment, and are discharged from the recording head cartridge 1 and corroded by ink mist contained in the inside atmosphere of the apparatus, or slide with the pinch roller holder 9 for a long time. Wear is reduced, and the rotational load of the pinch roller 7 hardly increases even after long-term use.

In FIGS. 3 and 4, on the opposite side of the sheet feed roller 6 with the recording head cartridge 1 interposed therebetween, a sheet discharge roller 15 for discharging the printed sheet out of the apparatus is provided in two rows of platens 14. Attached to. The sheet discharge roller 15 rotates in synchronization with the sheet feed roller 6 by receiving a driving force from the sheet feed roller 6 via the idle gear train 21. A spur 16 attached to the guide rail 12 is disposed above the sheet discharge roller 15.
The sheet 5 is pressed against the spur 16 by a spring (not shown) from below, thereby holding and conveying the sheet. A sheet sensor 25 is provided on the sheet supply port 121 side opposite to the recording head cartridge 1 with the sheet feed roller 6 interposed therebetween, and a discharge sheet sensor 17 is provided between the two rows of discharge rollers 15.
The presence or absence of the sheet 22 in each vicinity is detected.

FIG. 23 is a front view of the sheet supply port 121 side of the recording apparatus according to the present embodiment.

The platen 14 has a paper guide 14a at the left end, which serves as a reference when inserting a sheet. Further, among a plurality of protruding ribs formed on the surface of the platen 14, the rib 14b closest to the paper guide portion 14a is:
In order to prevent the sheet from being caught when approaching the sheet guide portion 14a, a gentle slope is formed on the slope opposite to the sheet guide portion 14a. In addition, platen 1
Numeral 4 has a concave portion 14c and stores the leading end of the sheet sensor 25 when a sheet is not inserted. The sheet sensor 25 has a tapered portion 25a formed at a portion opposite to the sheet guide portion 14a. For this reason, when the sheet is inserted farther from the sheet sensor 25 than the sheet sensor 25 and farther from the sheet sensor 25, and is then moved toward the sheet guide 14a, the sheet and the sheet sensor 25 may be damaged. Can be prevented. [Recording Unit] The function as a recording device is to perform one-line recording on a sheet by discharging ink downward in FIG. 3 according to a recording signal by the recording head cartridge 1 in synchronization with the reciprocating movement of the carrier 2. Things. That is, the recording head cartridge 1 includes a fine liquid ejection port (orifice), a liquid passage, an energy acting portion provided in a part of the liquid passage, and a droplet forming energy acting on the liquid in the acting portion. Energy generating means for generating energy. As an energy generating means for generating such energy, a recording method using an electromechanical transducer such as a piezo element, or irradiation of electromagnetic waves such as a laser to generate heat,
A recording method using energy generating means for discharging droplets by the action of the heat generation, or a recording method using energy generating means for discharging liquid by heating the liquid with an electrothermal converter such as a heating element having a heating resistance. and so on.

Among them, a recording head used in an ink jet recording method for discharging a liquid by thermal energy has a high density of liquid discharge ports for discharging a recording liquid to form a discharge droplet. Therefore, high-resolution recording can be performed. Among them, a recording head using an electrothermal transducer as an energy generation source can easily be made compact, and has the advantages of IC technology and micro-machining technology, which have recently made remarkable progress in technology in the semiconductor field and markedly improved reliability. This is advantageous because it can be used for two reasons, high-density mounting is easy, and the manufacturing cost is low.

When one-line printing is performed by moving the print head cartridge 1, the sheet is conveyed by the sheet feed motor 23 in the direction of the arrow shown as the conveying direction on the sheet in FIG. It is configured to record. [Recovery Unit] The recovery unit has a later-described recovery mechanism that removes ink and foreign matters accumulated in the nozzles of the recording head cartridge 1 by suction. In addition, an operation called a preliminary ejection operation for removing a small amount of foreign matter and ink remaining in the nozzles even when the recovery operation is performed is also performed. In the preliminary ejection operation, the recording head driving for normal printing is performed on the sheet 2.
2 at a predetermined position other than the above. The waste ink discharged by these operations is stored in a waste ink absorber 327 incorporated in the inner wall of the platen 14.

FIG. 30 is a diagram showing a piston drive transmission path of the recovery system from the sheet feed motor 23 of the ink jet recording apparatus. The rotation of the sheet feed motor 23 is changed from the LF motor gear 30 and the LF double gear 31 to the LF gear 1.
8, the sheet feed roller 6 rotates. When the carrier 2 reaches the non-recording area and the trigger gear 32 (coaxially slidably and rotatably mounted on the sheet feed roller 6) is pressed by the clutch switching protrusion 2c formed on the carrier 2, Trigger gear 32 is LF gear 1
8 directions, and L
The drive of the F gear 18 is transmitted to the trigger gear 32. The drive is transmitted to the pump gear 316 because the trigger gear 32 and the pump gear 316 mesh with each other in this state.

Normally, the trigger gear 32 is
And the pump gear 316 is provided with a toothless portion at a position where the pump gear 316 meshes with the LF gear 18.
The drive from the LF gear 18 is not transmitted to the pump gear 316. At the same time when the LF gear 18 and the pump gear 316 mesh with each other, the carrier 2 moves to the capping position, and the cap 317 closes the ink ejection port of the recording head cartridge 1. The pump gear 316 is the cylinder gear 3
Moving the piston in the cylinder 321 through 61;
Accordingly, ink is sucked into the cylinder 321 from the ink ejection port of the recording head cartridge 1 via the cap 317, and the ink ejection function of the recording head cartridge 1 is restored. Thus, the transmission of the driving force from the paper feed motor 23 to the pump gear 316 is performed by the pump gear 31.
6, LF gear 18, trigger gear 32 and carrier 2
Controlled by the movement of

FIG. 31 is an enlarged view around the switching mechanism of the ink jet recording apparatus. The trigger gear 32 is provided concentrically and slidably on the sheet feed roller 6. The trigger gear 32 and the pump gear 316 are in an engaged state. In this state, since the trigger gear 32 and the LF gear 18 are separated from each other, the drive from the LF gear 18 to the trigger gear 32 is not transmitted. Further, the pump gear 316 does not receive the driving force of the LF gear 18 because the portion that meshes with the LF gear 18 is missing (missing teeth).
When the carrier 2 moves further toward the LF gear 18,
The trigger gear 32 further moves to the LF gear 18 side, and the trigger gear 32 and the LF gear 18 come into contact. The contact surfaces (opposing surfaces) are provided with triangular teeth that mesh with each other.

FIGS. 32 and 33 are views showing the meshing shape of the LF gear 18 and the trigger gear 32, and FIG. 31 is a view showing the shape of the contact surface of the LF gear 18 with the trigger gear 32. FIG. 33 is a view showing a contact surface shape 32 a with the LF gear 18 provided on the trigger gear 32. The contact tooth shapes shown in FIGS. 32 (b) and 33 (b) are shapes viewed from the direction of the arrow. As shown in FIG. 32 (b), the contact surface shape is a tooth 18a having a triangular shape (hereinafter, triangular tooth), the pitch angle α is the same as that of the gear 18b,
In addition, the valley of the triangular teeth is set to be the same as the valley of the gear 18b. Further, as shown in FIG. 33 (b), the triangular teeth 32a having the same contact surface shape as the contact surface shape 18a of the LF gear 18 have the same pitch angle β as the gear 32b, and the triangular teeth have a peak 32b. Is set to be the same as the valley. Note that the pitch angle refers to an angle formed by an interval (pitch) between adjacent teeth with respect to the center of the gear.

With the above configuration, when the LF gear 18 and the trigger gear 32 come into contact with each other, the valleys of the triangular teeth of the contact surface 18a of the LF gear 18 and the peaks of the triangular teeth of the contact surface 32a of the trigger gear 32 mesh with each other. Gear 18 and trigger gear 32
Gears 18b and 32b have the same phase. Accordingly, the trigger gear 32 rotates with the rotation of the LF gear 18. Even if the trigger gear 32 moves to the LF gear 18 side,
Since the engagement between the pump gear 316 and the trigger gear 32 is not released, the rotation of the trigger gear 32 causes the pump gear 316 to rotate.

However, in such indirect driving of the pump gear 316 by the LF gear 18 via the trigger gear 32, the driving force is limited.

Therefore, as shown in FIG. 33, a wide cutout 316a extending in the radial direction is formed at the peripheral edge of the pump gear 316. That is, the pump gear 31
6 has a portion formed to be thicker than the trigger gear 32 and the LF gear 18, and the periphery of the pump gear 316 is partially cut away from the vicinity of the center in the axial direction toward one end (arrow E in the figure). ).

FIGS. 34 and 35 are views showing the configuration and arrangement of the pump gear and the trigger gear 32. FIG.
35 is a view from the right side, and FIG. 35 is a view of FIG. 30 from the left side.

As shown in FIG. 35, the width of the notch (in the figure,
The arrow F) has such a width that at least the notch 316a and the tooth portion of the LF gear 18 do not come into contact with each other even if the pump gear 316 and the LF gear 18 are located at positions where they mesh with each other. However, when the trigger gear 32 rotates slightly, the pump gear 316 rotates and the notch moves, so that the pump gear 316 and the LF gear 18 directly mesh with each other, whereby a large driving force is obtained. In this state, even if the carrier 2 is moved away from the LF gear 18 and the engagement between the trigger gear 32 and the LF gear 18 is released by a mechanism described later in detail, the pump gear 316 and the LF gear 18 are directly engaged. Therefore, the driving force is continuously transmitted. Further, the trigger gear 32 moves while being engaged with the pump gear 316 and is disengaged from the LF gear 18, so that the trigger gear 32
There is no problem such as tooth surface collision due to the movement of the gear. further,
Since the meshing state between the pump gear 316 and the trigger gear 32 is not required when the pump gear 316 and the LF gear 18 are meshed, the meshing area between the pump gear 316 and the trigger gear 32 is at least as shown in FIG.
It is only necessary to provide a meshing portion (hatched portion, arrow G in the figure) at least as large as the notch region as shown in FIG.
This allows the trigger gear 32 of the pump gear 316
Since the tooth width can be reduced at portions other than the meshing portion, different mechanical parts and the like can be arranged in that region.

Next, the mechanism for releasing the engagement between the trigger gear 32 and the LF gear 18 after the pump gear 316 and the LF gear 18 have been engaged will be described.

As described above, the trigger gear 32 and the LF
When the gears 18 are engaged, the triangular teeth formed on the contact surfaces of the two gears are in an engaged state. In this state, the carrier 2 is separated from the trigger gear 32 and the LF gear 18
The LF gear 18 and the pump gear 3
16 directly. Further, since no driving force is transmitted to the trigger gear 32, the trigger gear 32 tries to maintain the meshing state with the LF gear 18 (actually, the meshing may be released by vibration or the like).

From this state, the rotation of the LF gear 18 is reversed in order to cancel the drive transmission from the LF gear 18 to the pump gear 316. Then, the toothless portion 316a of the pump gear appears again, and at the same time, the pump gear 31
6, the gear portion meshing with the trigger gear 32 (FIG. 35, G
) And the trigger gear 32 are in a meshing state again. When the LF gear 18 is further rotated, the pump gear 3
There is no direct transmission of drive between the gear 16 and the LF gear 18 and the rotation of the pump gear 316 stops.

However, the trigger gear 32 is connected to the LF gear 18.
The pump gear 3
The drive transmission to 16 is performed through the trigger gear 32. At this time, as shown in FIG.
Is the arm 3 of the cylinder 321 in the missing tooth position state.
21a does not rotate because it abuts against the concave wall surface 316c of the pump gear 316 to prevent rotation. For this reason, a force in the thrust direction acts on the trigger gear 32 along the tooth surface of the gear of the pump gear 316, and the trigger gear 32 is separated from the LF gear 18. Next, with reference to FIGS. 36 to 42, the recovery means including the cap and the cylinder will be described.

FIGS. 36 to 42 are explanatory views of the operation of the recovery system in this embodiment. Cap 317 formed of chlorinated butyl rubber or other suitable material having elasticity
It is held integrally by the cap holder 341. The cap holder 341 is rotatably connected to an arm 321a extending integrally from the cylinder 321 via a connecting pin 341b protruding from the cap holder 341.
The cylinder 321 has a piston 342 made of an elastic material such as rubber inside, and it is possible to generate a negative pressure in the cylinder 321 by driving the piston shaft 343. Piston shaft 343 and piston 342
Will be described later.

The cap 317 is provided with a joint 317a integrally formed with the cap 317. By press-fitting the joint portion 317a into a joint portion 321b provided on the cylinder 321 with an interference, the cylinder 321 and the cap 317 are connected to each other in a sealed state. In addition, an ink suction port 321c is provided inside the joint 321b provided in the cylinder 321 so that the cap 317 communicates with the inside of the cylinder.

Next, a method of pressing and releasing the cap 317 against the recording head cartridge 1 will be described with reference to FIGS. As described above, the cap holder 341
The cap 317 held integrally with the cylinder 321
Further, the cap holder 341 is rotatably held on the cylinder 321 by the cylinder arm 321a. Here, although the cap 317 and the cylinder 321 are connected by the joints 317a and 321b, the joint 317a is formed integrally with the cap 317 by an elastic body such as chlorinated butyl rubber. Since it is made, there is no hindrance to the rotation of the cap holder 341 (see FIGS. 37, 38 and 39).

As shown in FIGS. 37 and 38, a different-diameter compression cap spring 344 is provided below the cap holder 341 between the platen 14 and the cap holder 341. Biased to the side. Here, the cylinder 321 is rotatably supported on the cylinder axis by the platen 14. Therefore, a rotational force is applied to the cylinder 321 and the cap 317 about the cylinder axis by the compression cap spring 344 of different diameter.

As shown in FIG. 35, a cylinder control section 321d is formed integrally with the cylinder 321. The tip of the cylinder control section 321d is connected to a pump gear 316.
Cap control section cam section 316a as the first cam member
Is in contact with Therefore, the rotation of the cylinder 321 is controlled by the cap control cam portion 316b of the pump gear 316 via the cylinder control portion 321d. That is, when the cylinder control section 321d moves up and down along the cap control cam section 316b of the pump gear 316, capping of the cap 317 on the recording head cartridge 1 via the cylinder 321 and release of capping can be performed.

FIGS. 37 and 38 show the cap 317 pressed against the recording head cartridge 1, and FIG. 39 shows the released state. In FIG. 38, the cap control spring 318
Is limited by the spring restricting portion 14 d of the platen 14 and is separated from the lower surface of the cap holder 341. Therefore, the pressing state of the cap 317 is not affected at all.

FIG. 39 shows a state in which the cylinder 321 is rotated by the rotation of the pump gear 316, and the cap 317 is separated from the recording head cartridge 1. In this state, the cap control spring 318 is
The cap holder 341 is rotated clockwise by contacting the lower surface of the cap holder 341. Accordingly, the cap holder 34
1 rotates clockwise, but stops when the stopper 341a protruding from the cap holder 341 contacts the cylinder arm 321a. At this time, cap 31
If the position of the stopper 341a is set so that the recording head cartridge 1 and the recording head cartridge 1 are parallel to each other, the relationship between the cap 317 and the recording head cartridge 1 can always be kept parallel when the cap is released.

As described above, since the posture when the cap is released is stabilized, even if the amount of movement for opening the cap 317 is reduced, the cap 317 and the cap holder 34 can be moved.
Since the cap 317 does not contact the recording head cartridge 1 due to the inclination of 1, the size of the apparatus can be reduced.

The pump gear 316 can be selectively connected to the LF gear 18, and the driving force of a paper feed motor (not shown) is transmitted to the LF gear 18 via a gear train (not shown). When the clutch operation is performed by the movement of the carrier 2, the driving force transmitted to the LF gear 18 is transmitted to the pump gear 316. Here, when the carrier 2 does not perform the clutch operation, the transmission of the LF gear 18 is cut off and the driving force is not transmitted to the pump gear 316 because the pump gear 316 has a partially missing tooth portion.

The movement of the piston shaft 343 and the piston 342 will be described. In FIG. 35, the pump gear 316 meshes with the cylinder gear 361. That is, when the carrier 2 performs the clutch operation, the rotation of the LF gear 18 is transmitted to the pump gear 316 and further transmitted to the cylinder gear 361. Furthermore, the cylinder gear 361
The boss 361 a provided on the inner wall is fitted into a lead groove 343 a provided on the piston shaft 343, and the cylinder 32 is inserted into a groove 343 b provided on the tip of the piston shaft 343.
The rotation of the pump gear 316 can be converted into a linear movement of the piston shaft 343 by stopping the rotation of the piston shaft 343 by fitting the guide 321e provided on the first shaft 331.

The piston shaft 343 has two flange portions 343c and 343d formed integrally with the shaft. A so-called donut-shaped piston 342 made of an elastic member such as silicone rubber or NBR rubber and having a through hole in the center is set between the flange portions. Naturally, the cylinder 321 and the piston 342 have a cylindrical shape, and the piston 342
Has a larger outer diameter and a certain interference (about 0.2 mm to about 0.5 mm). Therefore, even when the piston 342 moves, the inner wall of the cylinder and the outer wall of the piston can maintain the sealing property.

The cylinder seal 345 also has a donut shape. The outer diameter of the cylinder seal 345 maintains the sealing property with the inner diameter of the cylinder, and the inner diameter of the cylinder seal 345 maintains the sealing property with the piston shaft 343. . The cylinder washer 346 is locked to a different diameter portion provided on the cylinder 321. A rib 342a is provided on the side surface of the piston 342 so as to face the flange 343c over the entire circumference, and the inner diameter of the piston 342 is larger than the outer diameter of the piston shaft 343, and a gap is provided. Further, the width of the piston 342 is smaller than the distance between the two flange portions provided on the piston shaft 343. These gaps are for discharging the sucked ink and will be described later. The initial state of the pump is shown in FIG.
36, the piston shaft is pulled up, that is, the piston 342 is also pushed by the flange 343d and is in the position of FIG.

Next, when the suction signal is output from the MPU,
The carrier 2 performs a latching operation, and the driving force is transmitted from the LF gear 18 to the pump gear 316 and the cylinder gear 361,
The rotation to the cylinder gear 361 becomes a linear motion of the piston shaft 343. When the piston shaft 343 moves leftward in the figure, the flange 343c is pressed against the rib 342a on the side of the piston as shown in FIG. 40, and the space 321f on the right side of the piston 342 is closed. Further, when the piston shaft 343 moves to the left, the volume increases while the space 321f remains closed, so that the space 321f gradually becomes lower than the atmospheric pressure (negative pressure state). This negative pressure is the piston shaft 343
(Piston 342) gradually increases with movement,
The maximum occurs when the end of the side surface of the piston 342 passes through the ink suction port 321c (FIG. 41).

The reason is that the space 321f and the ink suction port 3
This is because the communication of 21c allows ink or air to flow into the space 321f from the outside via the ink suction port 321c and the cap 317, so that the negative pressure in the space 321f is eliminated.

Here, the piston 342 is connected to the ink suction port 32.
By forming a cap control cam portion 316a provided on the pump gear 316 so that the cap 317 seals against the recording head cartridge 1 when passing through the recording head cartridge 1, ink can be sucked.

Next, the discharge of ink from the cylinder will be described with reference to FIG.

As described above, the ink sucked from the recording head cartridge 1 stays in the space 321f in the cylinder.
3 (moving in the direction of arrow B), the piston shaft 3
Since the width of the piston 342 is smaller than that between the flanges 43 and the inner diameter of the piston is larger than the outer diameter of the piston shaft 343, the piston passes through the gap between the piston 342 and the piston shaft 343 as the piston shaft 343 (piston 342) is pulled up. The ink in the space 321f
42 to the space 321h on the left side of FIG.
Flow of two arrows C).

Therefore, as the reciprocating operation of the piston shaft 343 (piston 342) is repeated, the cylinder 321
The ink is gradually discharged from the end 321g.

A cylinder absorber 326 is inserted into the cylinder end 321g. The cylinder absorber 326 is formed of a foamed sponge, and a material having good ink transmission properties is selected. That is, a performance of efficiently discharging the ink in the cylinder 321 to the outside is required. In the present embodiment, a melamine resin-based foam material is used. The cylinder absorber 326 is in contact with a waste ink absorber 327 contained in the platen 14. Waste ink absorber 32
For 6, a material having a high ink holding ability, such as a laminated sheet of sheets or a polymer absorber, is selected.

With this configuration, the waste ink sucked from the recording head cartridge 1
21, waste ink absorber 3 via cylinder absorber 326
27 and is held there. In the present embodiment, the volume of the waste ink absorber 327 itself is about 120 cubic centimeters, but the amount of ink that can be retained there is about 7 cubic centimeters.
It has been experimentally confirmed to be 0%, 84 cubic centimeters.

Next, based on FIG. 3, FIG. 30, FIG. 32 and FIG. 43 to FIG.
The operation of fixing the carrier 2 under the control of the pump gear 316 will be described. FIG. 43 is a diagram showing the unlocked state of the lock arm in the present embodiment from the left side in FIG. FIG. 44 is a diagram showing the lock arm fixed state from the left side in FIG. 30. FIG. 45 is a diagram showing the carrier released state by the lock arm 370 from the near side in FIG. FIG. 46 is a diagram illustrating a state where the carrier is fixed by the lock arm according to the present embodiment from the near side in FIG. 30.

As shown in the above description of the recovery system operation, the opening and closing of the cap 317 is carried out on the left side of the pump gear 316 in FIG.
A cap control cam portion 316b controlled through the lock arm 370 is provided on the right side of the pump gear 316 in FIG. 30 to engage with the boss portion 370a of the lock arm 370. A lock control cam portion 316d, which is a second cam member for performing release control, is formed in a groove shape. FIG. 43 and FIG.
In, the boss 370a of the lock arm 370 and the lock control cam 316b of the pump gear 316 are engaged with each other. As shown in FIGS. 3 and 30, the lock arm 370 is connected to the right side of the device, the LF gear 18 and the pump gear 3.
The recording head cartridge 1 is provided within a range substantially equal to the width of a gear train such as 16 and is outside the moving range of the carrier 2 on which the recording head cartridge 1 is mounted.

The mounting state of the lock arm 370 will be described with reference to FIGS. 43 and 44. The rotation center portion 370b of the lock arm 370 is formed in a bearing shape in which a part thereof is in an open state, and is rotatably supported on the guide shaft 5. The rotation center 370b
Is elastic, and is supported by the guide shaft 5 by forcibly pushing the release portion provided in the rotation center portion 370b from above the guide shaft 5. The boss 370a described above is provided near the center of the lock arm 370, and the pump gear 3
It is engaged with 16 lock control units 316b.

Further, the lock arm 370 extends from the rotation center 370b toward the boss 370a, and has a lock 370c. As shown in FIG. 3 and FIG. 30, the lock portion 370c of the lock arm 370 is formed in an L-shape before being longer in the direction of the boss portion 370a than the rotation center portion 370b. Further, as shown in FIGS. 45 and 46, the lock portion 370c has a carriage fixing portion 370 which can be engaged with the lock protrusion 2d provided on the carrier 2.
A restricting portion 370e that can be engaged between the frame 4 and the arm engaging portion 12a of the guide rail 12 is provided.

The operation of fixing and releasing the carrier 2 by the lock arm 370 will be described with reference to FIGS. 43 and 45.

The pump gear 316 is in the initial state as shown in FIG. 43 as described in the description of the drive transmission and recovery system. That is, the driving force of the LF gear 18 is not transmitted to the pump gear 316, and the cap control cam portion 3
A cap (not shown) is released by 16b. When the lock arm 370 is in the initial state, the lock control cam 316 of the boss 370a and the pump gear 316 is pivoted about the rotation center 370b.
and d. As a result, the lock portion 370c is also located at the upper position. FIG. 45 shows the positional relationship between the L-shaped portion of the lock portion 370c and the carrier 2 in this state. The carrier fixing portion 370d is located above the lock protrusion 2d of the carrier 2, and the carrier 2 is in a movable state.

Next, a state where the carrier 2 is fixed by the lock arm 370 will be described with reference to FIGS. 44 and 46.

The pump gear 316 is capped as shown in FIG. 44, as described in the description of the drive transmission and recovery system. That is, the lock arm 370 is connected to the pump gear 316, the lock control cam 3
The boss 370a is lowered by 16d, so that the boss 370a is lowered. The lock portion 370c is also lowered. In this state, the lock portion 370c
FIG. 46 shows an engagement state between the L-shaped portion and the carrier 2. The carrier fixing portion 370d is engaged with the lock projection 2d of the carrier 2, and makes the carrier 2 immovable. In addition, the restricting portion 370e is connected to the guide rail 12
Is located between the arm engaging portion 12 a and the frame 4. Therefore, even when the carrier 2 is forcibly moved, the lock portion 370c of the lock arm 370 can reliably stop the carrier 2, and an excessive force is applied to the rotation center portion 370b and the boss portion 370a. A stable operation can be achieved without any problem.

As shown in FIGS. 3 and 30, the tip 370f of the lock arm 370 is located on the left side of the cap 317. For example, for some reason carrier 2
Is separated from the cap 317, and when the cap 317 is at the same position as when it is mounted on the carrier 2, when the carrier 2 is forcibly moved to the position of the cap,
Since the cap 317 is in a business trip state, the cap 31 is used by the carrier 2 and the recording head cartridge 1.
7 or the cap 317 may damage the recording head cartridge 1.
Therefore, as shown in FIG. 3 and FIG.
70, the distal end 370f is extended.
At 70f, the lock projection 2d of the carrier 2 is prevented from moving to the right cap mounting position to avoid damage.

43 to 46, the arm stopper 4a provided on the frame 4 secures a clearance 4b with respect to the upper surface of the unlocked lock arm 370 in FIG. 45 and is located above the lock arm 370. ing. This clearance 4b has a chamfered dimension 370 at the tip end of the boss 370a of the lock arm 370 shown in FIG.
g, the distance 307h from the center of rotation of the lock arm 370 to the center of the boss 370a in FIG. 43, and similarly the distance 370i from the center of rotation to the arm stopper 4a, have a relationship of 370g × (370i / 370h)> 4b. It is configured.

Here, consider a case where a drop impact or the like is applied to the recording apparatus. Usually, the lock arm 370 fixes the carrier 2. That is, the state is as shown in FIGS. When the recording device is accidentally dropped with the top surface of the recording device facing down, the lock arm 370 is provided with the lock arm 370 as shown in FIG.
Strong inertial force acts upwards (experimentally 30c
m, a 150-200 G acceleration is applied).
Boss 370 of lock arm 370 up to a certain force
a can be held by the engagement of the lock control cam portion 316d of the pump gear 316, but when the pump gear 316 becomes unable to withstand, the boss portion 3
In order to prevent breakage of the pump gear 316, the pump gear 316 and the platen 14 supporting the pump gear 316 are elastically deformed, and the boss 37
0a pushes the pump gear 316 out of the lock control cam portion 316d.

The case will be described with reference to FIGS. 47 and 48 are enlarged views of the pump gear 316. In FIG. 47, the position of the pump gear 316 is
This is a position when the lock arm 370 fixes the carrier 2, and the reference numeral 370 (a) shows the position of the lock arm 370 in a normal state.

When the above-described impact is applied, in FIG.
The lock arm 370 moves upward (in the direction of the arrow in the figure) because the boss 370a comes off the lock control cam 316b. However, since the lock arm 370 comes into contact with the arm stopper 4a and stops, the reference numeral 370 in FIG.
Stop at the position shown in (b). When the user turns on the power in this state, the recording apparatus first performs a cap opening operation to perform initialization. That is, the pump gear 316 is rotated clockwise (see FIG. 48).

Although the boss 370a of the lock arm is disengaged from the lock control cam 316d, the boss 37 is formed by the clearance 4b of the arm stopper 4a.
A part of the tip chamfering of the lock control cam portion 316
You can see that it is in d. FIG. 49 shows this state in cross section. Lock arm 370 has frame 4 on one side.
Is not tilted because it is received. Pump gear 31
6 is pushed away by the boss 370a. Further, a part of the chamfered end portion of the boss 370a enters into the lock control cam 370d. At this time, the force 370j received by the lock arm 370 due to the repulsive force of the pump gear 316 can be decomposed into 370k and 370l, and the component force 37
0l is a force for moving the lock arm 370 downward.

In this state, if the pump gear 316 further rotates clockwise in FIG. 48, the contact surface between the tip of the boss 370a and the lock arm controller 316d is in dynamic friction, so that the boss 370a of the lock arm 370 moves downward. Is returned to the lock control cam section 316d.

Therefore, even if the user accidentally drops the recording device, it is possible to provide a recording device that can return to normal by turning on the next power supply. Further, since it is not necessary to unnecessarily increase the strength of the boss 370a of the lock arm 370, the pump gear 316, and the platen 14, a compact, lightweight, and highly reliable recording apparatus can be provided.

FIG. 50 shows another embodiment.
70a has a hemispherical tip. In this case, the radius corresponds to 370 g. Of course, it is not necessary for the cylindrical boss to be chamfered on the periphery, and the prism may have a chamfered shape with one edge. It is sufficient if there is a certain amount of chamfered shape in the direction regulated by the stopper.

In this apparatus, the waste ink absorber 327 is discharged from the recording head cartridge 1 by the recovery means.
It also has the following configuration for accurately detecting the amount of waste ink stored in the printer. EEPRO placed on control board 57
M509 (see FIG. 15) includes a 4-byte area (hereinafter, a preliminary discharge counter) for integrating the amount of ink discharged by the preliminary discharge operation in units of 1 ng (10-9 g), and an ink discharged by the recovery operation. A 2-byte area (hereinafter referred to as an evaporation counter) in which the ink amount occupying a predetermined ratio of the ink amount and expected to evaporate with the passage of time in units of 10 mg (10-2 g), and discharged by a recovery operation The amount of ink that occupies a predetermined ratio of the ink amount and is considered not to evaporate in the future is 10%.
A 2-byte area (hereinafter referred to as a non-evaporation counter) that is integrated in mg (10-2g) units, and a 1-byte area that stores the elapsed time from the previous calculation of the waste ink amount to the present in 1 minute units (Hereinafter, waste ink timer).

The total amount of waste ink stored in the waste ink absorber 327 at each time is obtained by the sum of the evaporation amount, the non-evaporation amount, and the preliminary ejection counter value. When the preliminary ejection is performed at a timing such as during the recovery operation, before the sheet feeding operation, during the recording operation, and the like, the total number of the preliminary ejection amount according to the number of ejections of each nozzle and the ejection amount per ejection is added to the preliminary ejection counter. You. The preliminary discharge counter can add up to about 4,000 mg,
As shown in the flowchart of the preliminary ejection counter value check shown in FIG. 51, 100,000,000 ng (100 m
When the value exceeds g), it is divided into an evaporating amount and a non-evaporating amount according to a predetermined ratio, and is added to an evaporating amount and a non-evaporating amount counter, respectively. When ink is discharged by the recovery operation, the discharge amount stored in advance is added to the evaporation counter and the non-evaporation counter depending on the type of the recording cartridge 1 and the type of the recovery operation, respectively.

FIG. 52 is a flowchart for calculating the amount of waste ink evaporated by the present apparatus. At a timing such as when the apparatus power is turned on, when the apparatus is reset, or when a recovery operation is to be performed, it is determined in step S202 whether or not the waste ink timer value exceeds a predetermined time T. To set the waste ink timer value to a predetermined time T
Is updated to the value obtained by subtracting. Further, in step S204, an evaporation counter value is calculated by subtracting the amount of ink that is considered to have been evaporated within the predetermined time, and the process returns to step S202 to repeat this procedure. Thereafter, the amount of waste ink discharged by the operation to be performed at present is added in the above-described procedure to calculate a new total amount of waste ink.

The following formula is used to calculate the amount of ink that is considered to have evaporated within the predetermined time T.

(Evaporated ink amount per predetermined time T) = k1
× (evaporation counter value / non-evaporation counter value) Accordingly, the evaporation counter value after the elapse of the predetermined time is represented by: evaporation counter value = evaporation counter value × (1−k1 / non-evaporation counter value). . Here, k1 is an evaporation coefficient determined from FIGS. 53 and 54 obtained by experimentally determining the evaporation characteristics of the ink and the waste ink absorber 327 used in this apparatus.

FIG. 53 shows that 50%, 25%, and 50% of the amount of ink that can be stored in the waste ink absorber 327 of this apparatus is approximately 84 g.
The graph shows the ink remaining rate (weight ratio) when the ink is filled with 12% and left as it is.

FIG. 54 shows the amount of non-evaporated ink that occupies a predetermined ratio in the filled ink and is not expected to evaporate in the future, and the amount of evaporation expected to evaporate over time. It represents the amount of evaporated ink per a predetermined time T with respect to the ratio to the amount of separated ink (the residual ratio of evaporated ink). The above equation is obtained by approximating these diagrams with a straight line having a slope k1.

Incidentally, the amount of ink discharged to the waste ink absorber 327 may be directly measured using a weighing machine or a flow meter.

If the total amount of waste ink calculated by the above procedure exceeds a predetermined waste ink warning amount, the control board 57
The user is notified of the fact by the buzzer sound emitted from and the lamp lighting, but if the warning is canceled by the user's operation, the device can be used. In addition, when the total amount of waste ink decreases with time and falls below the waste ink warning amount, the notification to the user is stopped, and normal use is enabled.

If the total amount of waste ink further increases and exceeds a predetermined waste ink error amount, the user is notified by a buzzer sound emitted from the control board 57 and lighting of the lamp. Decreases,
When the amount of waste ink falls below the amount of waste ink, the apparatus can be used if the warning is canceled by a user operation in the same manner as in the case of the waste ink warning. If the total amount of waste ink decreases further after a lapse of time and falls below the waste ink warning amount, the notification to the user is stopped, and normal use is enabled.

With the above arrangement, the waste ink absorber 327
By accurately detecting the amount of waste ink accommodated in the printer, it is possible to prevent leakage of waste ink being carried without increasing the volume of the apparatus. Further, since the storage area required for the above detection is minimized, it is not necessary to increase the capacity of the EEPROM 509, and it is possible to prevent an increase in the capacity of the apparatus and an increase in cost. [Head Attachment Unit] Next, the head that can be attached will be described. In the above description, the carrier 2 of the present recording apparatus is used.
The above description has been made with reference to the example in which the recording head cartridge 1 is detachably mounted.
19 will be described in more detail.

The recording head cartridge 1 has two types, a monochrome recording head section 49 shown in FIG. 17 and a color recording head section 50 shown in FIG.
, A scanner head 200 capable of reading a document inserted in place of a sheet, or any of a total of three types of head units, can be mounted on the carrier 2 of the present apparatus. Hereinafter, when the three types of the monochrome recording head unit 49, the color recording head unit 50, and the scanner head 200 are collectively referred to, they are simply referred to as “head unit”.

First, referring to FIG. 16, a description will be given of a case where the above three types of heads are detachably mounted. FIG. 16 shows FIG.
3 is a perspective view of the carrier 2 when the head unit (recording head cartridge 1) shown in FIG. Carrier 2
Is provided with a cable terminal 3a of the flexible cable 3 at one end. When any one of the monochrome recording head unit 49, the color recording head unit 50, and the scanner head 200 is mounted on the carrier 2, the cable terminal unit 3a has a head terminal unit 656 (FIG. 17, 1) of each head unit.
8 and 19), thereby making an electrical connection with the head.

On the surface of the carrier 2 on which the cable terminal portion 3a is provided, two head portion positioning projections 2a and 2b are provided.
Are provided integrally. When the head portion is mounted on the carrier 2, the head portion positioning projection 2a fits into the positioning notch 657 on the head portion side, and the head portion positioning projection 2b fits into the positioning hole 658 on the head portion side. Accurate positioning with respect to the carrier 2 is performed.

Further, the cable terminal portion 3 of the carrier 2
A contact spring 28 is provided at a position opposed to a, and a head guide 29 of a resin molded product is mounted at a tip end thereof. That is, the head guide 29 is elastically supported by the carrier 2.

When the head portion is mounted on the carrier 2, the head guide 29 connects the head portion to the cable terminal portion 3.
The electrical connection between the cable terminal portion 3a and the head terminal portion is realized by biasing to the a side. The head guide 29 bends at the time of exchanging the head portion, thereby enabling the head guide 29 to be attached and detached, and to hold the mounted head portion so as not to come off.

When the user replaces the head section, the user inserts the head terminal section 656 side of the head section so as to face the cable terminal section 3a of the carrier 2 and pushes the upper surface of the head section downward to thereby replace the head section. Guide 29 bends,
The mounting of the head is completed. At this time, the electrical connection is also completed. Further, when removing the head unit, the head guide 29 is bent by pulling up the head unit attaching / detaching operation units 51a, 53a, 200a provided on the head unit with a finger, and the head unit can be removed from the carrier 2. [Head Section] Next, the head section is shown in FIGS.
It will be described based on. FIG. 17 shows a monochrome recording head unit 49 for performing only monochrome printing (usually black).
It is a perspective view of. In FIG. 17, a discharge port surface 51b provided with a nozzle unit for discharging recording ink is formed in a portion in front of the monochrome recording head cartridge 51. Further, the monocto recording head cartridge 51 has a head terminal portion 656 for receiving an electric signal. By supplying an electric signal from the recording device unit 1 (not shown) to the monochrome recording head cartridge 51 via the head terminal unit 656, ink is ejected downward from the nozzle provided on the ejection port surface 51b in FIG. Can be performed. The positioning notch 657 and the positioning hole 658 are formed to fit the head positioning protrusions 2 a and 2 b provided on the carrier 2 to ensure the positioning with respect to the carrier 2. The inside of the monochrome ink tank 52 is filled with ink.

The monochrome ink tank 52 is connected to the monochrome recording head cartridge 5 by a latch portion 52a formed integrally and elastically with the monochrome ink tank 52.
1 is detachably fixed. The monochrome ink tank 52 and the monochrome recording head cartridge 51 have an ink flow path formed by a detachable joint (not shown). Therefore, ink is consumed by recording,
When the ink in the monochrome ink tank 52 runs out, the latch portion 52a is bent to
Is removed from the monochrome recording head cartridge 51, and a new monochrome ink tank 52 is mounted to continue printing.

FIG. 18 is a view for explaining color printing.
FIG. 2 is a perspective view of a color recording head unit 50. Only parts different from the monochrome recording head unit 49 will be described. On the discharge port surface 653b of the color recording head cartridge 53, four independent colors (not shown) for discharging four colors of yellow, magenta, cyan, and black in order to perform color recording.
Different types of nozzle groups are provided. The black ink tank 54 contains black ink inside, and the discharge port surface 653b
Are connected to a group of black nozzles provided in the printer. The inside of the color ink tank 55 is divided into three independent volumes, each containing a yellow ink, a magenta ink, and a cyan ink. Similarly to the black ink tank 54, the color ink tank 55 has three independent detachable nozzles (not shown) for yellow ink for the yellow nozzle group, magenta ink for the magenta nozzle group, and cyan ink for the cyan nozzle group. Are connected via a suitable joint. Black ink tank 54
Is provided with a latch 54a for replacement, and the color ink tank 55 is provided with a latch 55a for replacement.

As described above, color printing can be performed by attaching the color recording head unit 50 to the recording device unit 401, and when the black ink is exhausted, only the black ink tank 54 is replaced, When any or all of magenta and cyan are exhausted, only the color ink tank can be replaced.

FIG. 19 is a perspective view of a scanner head 200 described later. 17 and 18, X represents the distance from the positioning notch 657 to the ejection port surfaces 651b and 653b, and is the same value in the monochrome print head cartridge 51 and the color print head cartridge 53. In the case of the present embodiment, It is about 13 mm. On the other hand, Y of the scanner head 200 in FIG. 19 represents the distance from the positioning notch 657 to the reading section surface 200b, and is set shorter than X, and is about 9 mm in the present invention. From this Y value, the vertical difference between the horizontal position of the ejection port position and the reading unit surface in the vertical direction is 4 mm, which is the difference between the above 13 mm and 9 mm. Therefore, the scanner head 200
When the cap is mounted, even when the capping operation and the wiping operation are performed, neither the cap nor the blade touches the reading section surface 200b of the scanner head 200. As a result of this configuration, when the scanner head 200 is mounted, the reading surface 200b can be prevented from being stained by the cap 301 and the blade that have been stained with ink. [Scanner Unit] Next, a scanner unit which is one of the features of the recording apparatus of the present embodiment will be described. FIG. 20, FIG.
FIG. 1 shows a schematic sectional view and a perspective view of the scanner head 200. The LED light 207 emitted from the LED 206 for illuminating the original surface 209 illuminates the original surface 209 through the LED opening 211. The image light 208 on the original surface 209 passes through the field lens 204 provided in the sensor opening 212, the optical path is bent at a right angle by the mirror 203, passes through the imaging lens 201, and forms an image on the sensor 202.

The center of the sensor opening 212 is larger than the distance between the ink ejection port 213 of the monochrome recording head cartridge 51 and the color recording head cartridge 53 from the surface where each recording head cartridge contacts the carrier 2 for positioning. In the present embodiment, the displacement is about 4 mm. The LED 206 and the sensor 202 are electrically connected to each other and are drawn out to the outside by the wiring board 205. Electrodes are formed on the head terminal portion 256 of the wiring board 205, and are brought into contact with the electrodes of the carrier 2 (not shown) by pressure contact.
The signal can be guided to the control circuit on the main body side.

The appearance of the scanner head 200 is the same as that of the recording head cartridge 1 with the ink tank 8 mounted thereon. Can be mounted. In addition, when the head portion is detached, when the head portion attaching / detaching operation portion 200a is lifted, the latch of the claw portion 210 is released, so that the claw portion 210 can be easily removed.

When the scanner head 200 is mounted on the carrier 2, the ASIC 500 (see FIG. 15), which will be described later, automatically identifies the scanner and enters the scanner mode. When a scanner reading signal is input from a host computer or the like, the ASIC 500
Similarly to the case described above, the document to be read is conveyed to a predetermined position by driving the sheet feed motor 23, the LED 206 is turned on, and the image signal is read via the scanner driver unit 513 while driving the carrier motor 10.

Here, the driving speed of the carrier motor 10 can be changed depending on the original reading mode of the scanner head 200. The mode is a combination of the reading resolution and the gradation of each reading. Since the resolution in the main scanning direction where the sheet feeding direction of the scanner head 200 is 360 dpi, and the resolution of the sensor 202 of the scanner head 200 as the sub-scanning direction where the scanning direction of the carrier 2 is 360 dpi, 64
The output of the gradation is obtained, and the scanner head 200 is, for example, 360 dpi in the main scanning direction and 360 dpi in the sub scanning direction.
From the reading at 64 gradations, 90 dpi in the main scanning direction,
Reading can be performed in two gradations in the sub-scanning direction of 90 dpi.
There is also a mode in which the resolution in the main scanning direction is read at 200 dpi and the consistency with FAX is considered.

Main scanning direction 360 dpi, sub-scanning direction 36
In a mode with a large amount of data, such as reading at 64 dpi at 0 dpi, it takes time to process and transfer data. Therefore, the carrier drive speed is reduced, and reading at 2 tones at 90 dpi in the main scanning direction and 90 dpi in the sub-scanning direction is performed. Carrier drive speed can be increased. When reading of one line is completed, the sheet is conveyed by one line by the sheet feed motor 23 and the next line is read. Such an operation is performed until the end of the document.

As described above, the recording apparatus of the present embodiment is capable of recording on the sheet 22 by the recording head cartridge 1 and reading the original sheet by the scanner head 200. When the term "recording paper" is used, the manuscript is also included, except for the case where only the recording is described. [Circuit Section] FIG. 15 is a block diagram showing the electrical configuration of the recording apparatus. Reference numeral 500 denotes an ASIC in which the MPU unit and the recording device-control unit are integrated. Reference numeral 504 denotes a flash ROM in which a program for controlling the entire recording apparatus is stored, reference numeral 505 denotes a mask ROM in which character fonts and the like are stored, and reference numeral 506 denotes a DRA used as a work area of the ASIC 500 and a signal buffer.
M is shown.

The EEPROM 509 has a rewritable RO.
M and the contents are not erased even if power is not supplied. For this reason, setting information performed by the user when the power is turned on, the amount of ink used, the integrated amount of discharged ink accumulated inside the printing apparatus, and the like are written.

The DC-DC converter 508 is a converter for converting a voltage from the adapter 507 into a power supply voltage used in the recording apparatus. The adapter 507 is a transformer for converting a household 100V AC voltage to a 13V DC voltage.

The recording device has a built-in battery 116 so that it can be used outdoors without a home power supply. Further, since the recording device has a built-in battery charging IC 510, it can be charged without preparing a separate charger.

Reference numeral 502 denotes a carrier motor driver for driving the carrier 2, and reference numeral 503 denotes a sheet feed motor driver for driving the sheet feed roller 6. Carrier motor driver 502 and sheet feed motor driver 503 are AIS
The motor is controlled by a control signal output from the IC 500.

Reference numeral 106 denotes a power switch for turning on the power of the main body, reference numeral 108 denotes a head exchange switch for moving the carrier 2 to the exchange position, reference numeral 107 denotes an error release switch, reference numeral 110 denotes a power lamp, and reference numeral 110 denotes a power lamp. 10
9 is an error lamp, 511 is a buzzer,
Each is shown.

For signal communication with the outside, communication with the host computer is performed by the interface connector 118 and the infrared module 501. The interface connector 118 is connected to the host computer by wire. The infrared module 501 is a serial communication port using infrared rays, and performs input and output of signals using infrared rays while facing the infrared port of the host computer.

An optional connector 58 is also provided for communicating with the optional ASF 127. The home position (HP) sensor 26 is a photo interrupter type sensor, and detects the position of the carrier 2 by sensing the edge of the carrier 2. The sheet sensor 25 and the discharged sheet sensor 17 are contact type sensors and detect the presence or absence of a sheet in the recording apparatus.

[0141]

According to the present invention, a driving roller for sandwiching and conveying a sheet in cooperation with a driven roller is formed into a thin hollow shaft,
In addition, since the driven roller is made of light metal, the recording apparatus can be made lightweight and portable. Further, even if the recording device is dropped unnecessarily, damage can be reduced.

Furthermore, the rotational load of the driving and driven rollers is reduced, and the driving and driven rollers can smoothly convey the sheet with almost no loss in sheet conveyance, and perform accurate image processing.

The driving roller is a thin hollow shaft having an outer diameter of about 6 mm to 8 mm and a thickness of 1 mm to 1.5 mm and a ratio of outer diameter to wall thickness of about 6: 1. It is possible to obtain an optimum thickness for achieving both weight reduction by hollowing, prevention of bending and runout of the driving roller, and improvement in roundness of the driving roller.

Further, since the upper and lower cases have a light driving roller, a simple structure can be formed by using the "leverage principle" so as to be tightly integrated as the screw is tightened. The device can be made even lighter.

[Brief description of the drawings]

FIG. 1 is a perspective view of an ink jet recording apparatus according to an embodiment of the present invention.

FIG. 2 is an obliquely upper right perspective view of the recording apparatus of FIG.

FIG. 3 is an internal perspective view of the recording apparatus.

FIG. 4 is a sectional side view of the recording apparatus.

FIG. 5 is a perspective view of the recording apparatus with a head replacement cover opened.

FIG. 6 is a perspective view of a monochrome tank replacement.

FIG. 7 is a sectional view showing a mounting structure of a head replacement explanation plate.

FIG. 8 is an explanatory view in which a head replacement explanation plate is attached to a head replacement lid.

FIG. 9 is an overall perspective view of a recording device in use.

FIG. 10 is a sectional side view of the upper and lower cases.

FIG. 11 is an enlarged view showing an engagement state between a hook portion of the upper and lower cases and a claw.

FIG. 12 is an enlarged view of a protrusion interposed between the upper and lower cases.

FIG. 13 is a plan view of a head replacement explanation plate.

FIG. 14 is a sectional side view in which an automatic sheet feeding apparatus is mounted on a recording apparatus.

FIG. 15 is a circuit block diagram of a recording apparatus.

FIG. 16 is a perspective view of a carrier.

FIG. 17 is a perspective view of a monochrome recording head.

FIG. 18 is a perspective view of a color recording head.

FIG. 19 is a perspective view of a scanner head.

FIG. 20 is a perspective view of a scanner head.

FIG. 21 is a sectional side view of the scanner head.

FIG. 22 is a front view of a sheet supply port of the recording apparatus.

FIG. 23 is a sectional view of a shield plate.

FIG. 24 is a cross-sectional view for explaining the operation of the switch unit.

FIG. 25 is an exploded perspective view of the internal structure of the recording apparatus.

FIG. 26 is a perspective view of the internal structure of the recording apparatus.

FIG. 27 is a perspective view for explaining the attachment / detachment operation of the battery.

FIG. 28 is a perspective view of a battery.

FIG. 29 is a perspective view of a battery.

FIG. 30 is a diagram showing a piston drive transmission path from a sheet feed motor of the recording apparatus to a recovery system, and is partially shown in section.

FIG. 31 is a cross-sectional front view of the vicinity of a switching mechanism of the recording apparatus.

FIG. 32 (a) is a side view of the LF gear, showing a portion engaged with the trigger gear. (B) It is the figure of the triangular tooth seen from arrow A in (a).

FIG. 33 (a) is a side view of the trigger gear, showing a portion engaged with the LF gear. (B) It is the figure of the triangular tooth seen from arrow B in (a).

FIG. 34 is a configuration diagram of a trigger gear and a pump gear, as viewed from the right side.

FIG. 35 is a configuration diagram of a trigger gear and a pump gear, as viewed from the left side surface.

FIG. 36 is an explanatory diagram of an operation of a recovery system for removing waste ink from a head cartridge.

FIG. 37 is an explanatory diagram of the operation of the recovery system.

FIG. 38 is an explanatory diagram of the operation of the recovery system.

FIG. 39 is an explanatory diagram of the operation of the recovery system.

FIG. 40 is an explanatory diagram of the operation of the recovery system.

FIG. 41 is an explanatory diagram of the operation of the recovery system.

FIG. 42 is an explanatory diagram of the operation of the recovery system.

FIG. 43 is a view of the unlocked state of the lock arm in the ink jet recording apparatus as viewed from the left side in FIG.

FIG. 44 is a view of the fixed state of the lock arm as viewed from the left side in FIG. 30;

FIG. 45 is a view of the carriage released state by the lock arm as viewed from the near side in FIG. 30;

FIG. 46 is a diagram illustrating a state in which the carriage is fixed by the lock arm as viewed from the front side in FIG. 30;

FIG. 47 is a view of a state where the lock arm is fixed and a state where the lock arm is released by an external force, as viewed from the left side in FIG. 30;

FIG. 48 is a view seen from the left side in FIG. 30 showing a state where the lock arm returns to the home position.

FIG. 49 is a cross-sectional view of the engagement between the pump gear and the boss on the lock arm in FIG. 48;

FIG. 50 is a cross-sectional view of the engagement between the pump gear and the boss when the tip of the boss is hemispherical in FIG. 49;

FIG. 51 is a flowchart of a preliminary ejection counter check.

FIG. 52 is a flowchart of calculating a waste ink evaporation amount.

FIG. 53 is a waste ink evaporation characteristic diagram.

FIG. 54 is a waste ink evaporation characteristic diagram.

FIG. 55 is a front view of a driving roller and a pinch roller (driven roller).

FIG. 56 is a left side view of FIG. 55.

[Explanation of symbols]

 D1 Outer diameter of pinch roller (driven roller) D2 Outer diameter of sheet feed roller (drive roller) d1 Outer diameter of rotating shaft part d2 Inner diameter of sheet feed roller 1 Recording head cartridge (recording device) 2 Carrier (recording device) 5 Guide Shaft 6 Sheet feed roller (drive roller) 7 Pinch roller (follower roller) 7a Rotating shaft section 15 Sheet discharge roller 22 Sheet 23 Sheet feed motor 49 Monochrome print head section 50 Color print head section 100 Upper case 100b Claw (engagement section) 101 Lower case 101a Convex portion (protruding portion) 101b Hooked portion (engaged portion) 123 Screw (screw) 200 Scanner head 500 AISIC (CPU)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Hasegawa 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Hiroyuki Inoue 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inside the Company (72) Inventor Akira Kida 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Takeshi Iwasaki 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc.

Claims (4)

[Claims] 1. A recording apparatus that weighs about 1 kg or less and conveys a sheet between a driving roller and a driven roller, wherein the driving roller is formed in a thin hollow shaft shape, and the driven roller is A recording device characterized by being made of aluminum. 2. The recording apparatus according to claim 1, wherein a ratio between an outer diameter and a wall thickness of the driving roller is set to about 6: 1. 3. The recording apparatus according to claim 1, wherein the outer diameter of the drive roller is set to about 6 mm to about 8 mm, and the thickness is set to about 1 mm to about 1.5 mm. 4. An upper and lower case which are separable by accommodating the driving and driven rollers, and one ends of the upper and lower cases are engaged by an engaging portion and an engaged portion which can be disengaged from each other. The other end is connected by a screw, and a projection is provided on one of opposing surfaces of the upper and lower cases at an intermediate position between the engagement portion and the engaged and the screw. Recording device.