JPH03193451A - Ink-jet recording device - Google Patents

Abstract

PURPOSE:To make easy attachment and detachment of a recording head and junction and release of electric connection of the recording head operable by a method wherein a means for positioning a fixing point of the recording head and a means for operation of the electric connection of the recording head are made integral with a cover of the recording head, and positioning of the fixing point of the recording head and electric connection and release for the recording head are made by operation for opening and shutting the cover. CONSTITUTION:A recording head 1 is installed to the title device with a head cover 250 thereof opened, a projection 262 of the head cover 250 is engaged with a cam 236 that is provided on a pin-receiving part 254 and, at the same time, the pin-receiving part 254 is engaged with a pin 214 of a carriage main body 210. As the head cover 250 is turned clockwise after the device is assembled up to the above-mentioned state, the projection 262 moves a connector slider 230 toward the recording head 1 through the cam 26. In the case where the head cover 250 is closed completely and a projection 252 of the head cover 250 is engaged with a cover fastener 216, a connector 9 of the connector slider 230 is engaged with a connector 126 of the recording head 1, making the recording head 1 fixed firm. Thereby, operation for attachment and detachment of the recording head and junction and release of electric connection for the recording head can be made easily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inkjet recording device.

[Prior Art] Conventionally, a movable part (hereinafter referred to as a carriage) is equipped with a recording head that moves back and forth perpendicularly to the conveyance direction of a recording medium (hereinafter also referred to as recording paper or simply paper). A so-called serial type recording apparatus (hereinafter referred to as a serial printer) having a serial type (hereinafter referred to as a serial printer) has been proposed in a form equipped with recording heads using various recording methods.

The recording head used in this serial printer has
There are wire tod methods, thermal methods, thermal transfer methods, and inkjet methods.

In particular, the inkjet method is attracting attention as a low running cost and quiet recording method because it jets ink directly onto recording paper.

As methods for fixing the recording head to the carriage using this inkjet method, there are two known methods: one in which the recording head is integrated with the carriage, and another in which a separate recording head is fixed to the carriage with screws. .

[Problems to be Solved by the Invention] However, in a configuration in which the recording head and carriage are integrated, it is impossible to replace the recording head body when replacing the recording head, and it is necessary to disassemble the device, which is extremely difficult. This requires complicated work and poses a problem in terms of maintenance.

In this respect, it is advantageous to separate the two, but in the conventional configuration in which the recording head is screwed to the carriage, there is a risk of shorting out the electrical connection of the recording head with a tool such as a screwdriver that removes the screws. Furthermore, if the screws are not completely tightened, there is a problem in that the recording head may become loose and the image may deteriorate.

In addition, when the recording head is installed and electrically connected to the recording device main body and ready to be driven, or when it is in the driving state, the electrical wiring of the recording head is effectively protected from the operator's hands and other objects. must be done.

The object of the present invention is to provide a serial type liquid jet recording device (
In an inkjet recording device (hereinafter referred to as an inkjet recording device), it is possible to easily attach and detach the recording head, and to securely position or fix the recording head, and to ensure that the electrical contacts are connected securely. The purpose is to ensure that wiring parts etc. are protected.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a recording head that performs recording by ejecting ink onto a recording medium, a recording head that is removably held, and a recording head that performs recording by ejecting ink onto a recording medium, and a recording head that is removably held. a holding member for scanning a medium; a cover member provided on the holding member for protecting the recording head by covering it when the recording head is mounted and opening the recording head when the recording head is removed; provided integrally with the cover member,
a fixing means for fixing the recording head in response to a closing operation of the cover member for covering the recording head; a fixing means provided on the cover member and disposed on an electrical connection member of the recording head and the holding member; It is characterized by comprising a connection part driving means for coupling the electrical connection member to the electrical connection member in accordance with the closing operation of the cover member.

[Function] According to the present invention, means for fixing or positioning the attached recording head and means for electrically connecting the recording head are integrated into a cover for protecting the recording head, Fixation or positioning of the recording head and electrical connection are performed by covering the recording head with the cover.
Since these are released by the opening operation, the attachment/detachment operation and the connection/disconnection of electrical connections can be easily performed, and the recording head can be reliably protected.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view of an inkjet recording apparatus according to an embodiment of the present invention, with the apparatus cover removed.

In FIG. 1, reference numeral 1 denotes a chip-shaped recording head, and 2 denotes a carriage on which the recording head 1 is mounted and which allows the recording head 1 to move for scanning. On the carriage 2, as will be described later, there are a support member for removably mounting the recording head 1, and a cover for protecting a substrate that forms part of the recording head 1 and has a head drive circuit printed thereon. A member (-dotted chain line in the figure) is provided.

The recording head 1 has 64 ejection ports arranged at its front end, and each of these ejection ports is provided with an ink liquid path communicating with the ejection ports. Furthermore, a common liquid chamber for supplying ink to these liquid paths is provided behind the portion where the ink liquid paths are provided. The ink liquid path corresponding to each of the 64 ejection ports includes an electrothermal transducer that generates ejection energy used to eject ink droplets from these ejection ports, and electrode wiring for supplying power to this element. is provided.

These electrothermal conversion elements and electrode wiring are formed by film-forming technology on a substrate made of silicon or the like, and further, by layering partition walls, a top plate, etc. made of resin or glass material on this substrate, the above-mentioned discharge port is formed. , an ink liquid path, and a common liquid chamber. Further to the rear of the above configuration in the recording head 1, a drive circuit in the form of a printed circuit board is provided for driving the electrothermal conversion element based on a recording signal.

In the carriage 2, a connector board 12 is disposed behind the recording head 1 described above via a connector 9. The connector board 12 is provided with a connector 9 for connection to the recording head 1 and a connector for flexible cable connection from the apparatus main body control circuit. Further, a capacitor, a resistor, and the like are attached to the connector board 12, and these compensate for a drop in the power supply voltage supplied via the flexible cable and noise intrusion into the signal. Further, the connector board 12 is supported on a sliding member as will be described later, and is configured to slide as the cover member is opened and closed, so that the connector 9 is connected to the terminal of the recording head 1.

The carriage 2 is slidably and rotatably engaged with a guide shaft 3 via its engaging portion 2a, and the guide shaft 3 is arranged so as to be perpendicular to the direction in which a recording medium such as recording paper is conveyed. It is provided over an area longer than the width of the paper. Further, the carriage 2 is connected to a part of a belt (not shown) stretched parallel to the guide shaft 3, and this belt is driven by a gear ridge motor (not shown), so that the carriage 2 is moved along the guide shaft 3. In other words, scanning movement of the recording head 1 becomes possible. Further, the carriage 2 and the recording head 1 obtain the force to rotate around the guide shaft 3 by their own weight, and this force is used as an urging force to move the slider provided on the carriage 2 to slide on the paper press plate. A paper pressing plate 8, which will be described later, is urged through the member. This allows the recording head 1 to maintain a predetermined distance from the recording paper depending on the thickness of the recording paper used.

Recording paper 6, which is fed by a paper feed cassette (not shown) or by hand, is fed into the main body of the apparatus through a paper feed port formed by an upper paper guide 7a and a lower paper guide 7b. A paper pressing plate 8 having a curvature is continuous to the vapor upper guide 7a as an extension thereof. The paper press plate 8 is
The recording paper is arranged so as to be pressed against the paper feed roller 5, and the frictional force generated between the recording paper and the recording paper during this pressing is
It is made of a material that is smaller than that formed between the paper feed roller 5 and the recording paper. Further, the paper lower guide 7b extends parallel to the paper presser plate 8 to a portion where the paper feed roller 5 is disposed.

As a result, the recording paper 6 fed from the paper feed port is conveyed toward the top of the apparatus by two I-lines as the paper feed roller rotates. At this time, the recording paper 6 slides on the plate-shaped platen 7 while the distance from the recording head 1 is regulated to a predetermined size by the paper press plate 8 and the platen 7.

The recording head 1 performs recording for one line by discharging ink droplets onto the recording area of the recording paper 6 facing it as it scans, and this recording and the transport of the recording paper for one line sequentially. Recording is performed line by line, and nine images of characters and the like are formed. The recording paper 6 on which the recording was made is
As the paper is transported, the paper is ejected onto a paper ejection tray (not shown) by a paper ejection roller 4 and spurs 40A and 40B provided above the recording paper transport path. A pair of spurs 40A, 4
Five pairs of spurs 0B are provided corresponding to the paper discharge rollers 4, and a spur cleaner is interposed between the spurs in each spur pair. Note that the members supporting these spurs and the spur cleaner are omitted in FIG. 1. Further, the spur 40A is configured to apply a pressing force to the paper discharge roller 4 via the recording paper, and the spur 40B is configured to regulate the conveyance path of the recording paper between it and the platen 7. The paper discharge roller 4 is driven to rotate at a higher circumferential speed than the paper feed roller 5, so that the portion of the recording paper 6 forming the recording area is pulled upward, and the recording paper 6 is lifted off the platen 7. It is possible to avoid defects in the recording area such as the following.

A series of configurations for ejection recovery processing are provided near the home position in an area continuous with the scanning area of the print head 1. That is, the blade 26 is used to remove water droplets, dust, etc. from the discharge port surface where the discharge port is disposed by its wiping action. Similarly, an absorbing member 25 for removing water droplets etc. from the discharge port surface by mainly absorbing them. A cap 13 is provided for sealing the ejection port surface, for empty ejection, and for capping for ink suction. Each of these members is configured to be able to move forward and backward with respect to the movement area of the recording head 1 while being integrally supported by the movable support member 14, and each performs each operation at an appropriate timing. Ink suction in the cap 13 is performed by a pump 24 that communicates with the cap 13 through the hollow portion of the movable support member 14 and a tube. When capping with the cap 13, the hole formed in the cap arm 17 attached to the side surface of the holding member of the cap 13 and the protrusion provided on the carriage 2 engage with each other, so that the recording head 1 is moved backward. To prevent rotation, the cap 13
Ensures capping of the discharge port surface.

Rotation of each of the paper feed roller 5 and the paper ejection roller 4,
Operation in the discharge recovery mechanism, ie, cap 13.
The integral movement of the blade 26 and the absorption member 25 and the suction operation of the pump 24 are performed using the rotational driving force of the feed motor 21. That is, the rotational driving force of the feed motor 21 attached to a part of the apparatus body frame is first transmitted to the transmission switching gear train 19. In this gear train 19, a selection gear (not shown) is moved in conjunction with the movement of the carriage 2, that is, scanning movement by the recording head 1, movement to the home position or ejection recovery device, and stopping at these positions. Selective switching of each gear is performed. As a result, the rotation of each gear in the gear train 19 is transmitted to the paper feed roller 5 and the paper discharge roller 4 via the feed intermediate gear 20, and is finally transmitted to the integrated cap 13 etc. via the cam 16. , furthermore, the pump 24 head gear 22 and the pump cam 2
3.

Ink is supplied to the recording head 1 from an ink cartridge 27 attached to the main body of the recording apparatus through a flexible tube that can follow the movement of the carriage 2. Furthermore, the movement position of the carriage 2 is determined based on the engagement position between the home position sensor 11 provided on the carriage 2 and the home position detection flag provided near the end of the movement area by the carriage 2, and the carriage motor This is detected by counting the number of steps.

FIG. 2 is a schematic perspective view showing the device shown in FIG. 1 with the top cover, which is part of the cover of the device, attached, and particularly shows the spur and spur cleaner in detail. ing.

In FIG. 2, 51 is a top cover that forms part of the cover of the apparatus of this embodiment, and 43 is a rotatably supporting spur 40B located on the upstream side of a pair of spurs arranged in the recording paper conveyance path. This is the spur shaft. The spur shaft 43 is the third
As detailed in the figure, it is pivotally supported by a shaft supporting member 51A provided on the back surface of the top cover 51. With this type of shaft support structure of the spurs, whereas conventionally the spurs that were individually attached to the cover were likely to be misaligned due to warping of the cover, etc., it is possible to prevent misalignment in the direction of the platen 7 between the plurality of spurs 40B. It can almost be eliminated. As a result, the distance between each of the spurs 40B and the platen 7 can be kept uniform, and recording paper can be conveyed favorably.

The downstream spur 40A and the spur cleaner 41 are rotatably supported by a spur holder 42, as detailed in FIGS. 3 and 4, and the spur holder 42 is rotatably supported by a spur shaft 43. It is movably supported by a shaft and biased toward the paper ejection roller 4 by a coil spring 44 disposed between the top cover 51 and the holder 42 . Due to this bias, the spur 40A presses the paper discharge roller 4 through the recording paper.

The top cover 51 is attached to the recording apparatus main body via the boss fasteners 51B provided at both ends of the back side of the top cover 51 and the above-mentioned spur shaft 43. That is, when attaching the top cover 51 to the main body of the device, first, the boss fasteners 51B fit into the bosses 50A provided on the side frames 50 that stand at both ends of the device, and then this fitting portion is While rotating the top cover 51 as a rotation shaft, both ends of the spur shaft 43 are fitted into shaft fasteners 50B similarly provided on the side frame 50 by a so-called snap fastening. The position where this shaft stopper 50B is provided is close to the platen 7. With the configuration in which such a top cover 51 is attached to the apparatus main body, and especially with the configuration in which the spur shaft 43 is fitted into a fixed part near the platen 7 of the apparatus main body, the spur 4
The distance between 0B and the platen 7 can be set uniformly and accurately. As a result, floating of the recording paper on the conveyance path from the paper presser plate 8 to the paper discharge roller 49 spur 40A is prevented, and it becomes possible to carry out the conveyance in a good manner.

3 and 4 are perspective views showing in detail the supporting structure of the spur and spur cleaner shown in FIGS. 1 and 2. FIG.

First, as shown in FIG. 3, the spur cleaner 41 is
The rotating shaft 41A is fitted into the shaft hole 42G of the holder 42, thereby attaching it to the holder 42. The shaft hole 42G is a hollow hole that is larger in diameter than the rotating shaft 41A, and the insertion opening into which the shaft 41A is inserted is slightly smaller than the diameter of the shaft 41A. Thereby, the spur cleaner 41 can displace its rotation shaft within the range allowed by the size of the shaft hole 42C, but does not come off from the holder 42. The spur 40A on the downstream side facing the paper discharge roller 4 has its shaft portion rotatably fitted into the spur fastening portion 42B of the holder 42.

Further, the spur 40B on the upstream side facing the platen 7 is first slidably and rotatably fitted onto the spur shaft 43, and its position is aligned with the disposed position of the spur 40B in the spur holder 42. While doing so, attach the spur shaft 43 to the spur holder 42.
It is rotatably fitted into the shaft fastening part 42A of.

Thereafter, as shown in FIG. 4, first, the spur shaft 43 is fitted into the shaft fastening portions 510A of the shaft supporting members 51A provided upright at both ends of the back side of the top cover 51. Along with this,
As shown in detail in FIG. 3, the projection 42D formed on the spur holder 42 is connected to the locking portion 510G of the locking member 51G erected on the back side of the top cover 51 against its elastic force. Let it be inserted. Thereby, the position of the spur holder 42 on the top cover 51, that is, the spur 40A
, 40B and the top cover 51 of the spur cleaner 41
The position in is determined. At this time, the spur holder 42 is
The protrusion 42D can rotate about the spur shaft 43 as a rotation axis within the range in which the protrusion 42D can move within the locking portion 510C. However, when the top cover 51 is attached to the main body of the apparatus, the spring 44 urges the top cover 51 in one direction in its rotational direction, thereby causing the spur 40A to press the paper ejection roller 4.

FIG. 5 is a sectional view of the spur holder seen from the back side in FIG. 3, and the spur cleaner is not shown.

As shown in FIG. 5, the spurs 40A and 40B are mounted such that their respective teeth 400A and 400B are offset in the longitudinal direction of the spur shaft 43. As a result, these teeth 4
Since the contact positions of the spur cleaner 41 that contact 00A and 400B are shifted, the ability of the spur cleaner 41 to absorb ink adhering to the teeth is improved compared to when both teeth are contacted at the same position.

Figure 6 (A) and (B) show spur 40A (40B)
FIG. 2 is a front view and a side view, respectively.

As shown in these figures, teeth 400A (400B)
is composed of two rows, and these rows are staggered so that the teeth alternate with each other. As a result, by having two rows of teeth, the force pressing against the cleaner 41 is smaller (and the durability of the cleaner is improved) than in the case of one row of teeth. , the width for pressing the recording paper is wide (the presser foot becomes stable and reliable).

In addition, by forming two rows of teeth that are alternately shifted,
The pitch of the teeth on the entire spur is small, so that when the leading edge of the recording paper enters between the spur and the platen or between the spur and the paper ejection roller as it is transported, the paper does not turn over, and the paper does not enter. becomes stable.

Note that the number of rows of teeth is not limited to two, and may be three or more rows if possible. For example, in the case of three rows, the teeth in the first row can be shifted so that the teeth in the second and third rows have an equal pitch.

Furthermore, the spur having the structure shown in FIG. 6 has a simple die-cutting structure in manufacturing.

FIG. 7 is a sectional view showing a modification of the spur shown in FIG. 6. Similar to the spur shown in FIG. 6, the teeth are formed in two rows with alternating offsets between the rows. The difference from the above spur is that these two rows of teeth are formed at a predetermined interval. According to this structure, since the die-cutting structure includes a slide structure, the die-cutting becomes relatively complicated, but it becomes relatively easy to form three or more rows of teeth.

FIG. 8 is a side cross-sectional view of the recording apparatus shown in FIGS. 1 and 2, particularly showing the spurs 40A, 40B and the spur cleaner 41 in detail.

As explained in FIGS. 2 and 3, the spur 40A,
40B is fixed in position by a spur holder 42, and a spur cleaner 41 is also held between these spurs by the spur holder 42. According to this configuration, when the paper ejection roller 4 is rotationally driven, the spur 40A that presses and engages with it rotates, and this rotation is caused by the spurs 40A, 4.
It is transmitted to the spur 40B through the rotation of the spur cleaner 41 that engages with both of the spurs 0B, and the spur 40B also rotates. By rotating the spur 40B facing the platen 7 in this manner, it is possible to prevent the paper from folding when the leading edge of the recording paper enters between the spur 40B and the platen 7.

At this time, it is desirable for the circumferential speed of rotation of the spur 40B to be equal to that of the spur 40A and the paper discharge roller 4 for conveying the recording paper. 41 acts as an idler to achieve this.

The biasing force for engagement between the spurs 40A and 40B and the spur cleaner 41 is obtained by the own weight of the spur cleaner 41.

That is, the rotation shaft 41A of the spur cleaner 41 is connected to the holder 4.
By engaging the shaft hole 42C of No. 2, the rotation of the cleaner 41 is supported, but since the shaft hole 42G has a hole shape with respect to the rotation shaft 41A, the rotation of the rotation shaft 41A is supported within this range. The position is displaceable. Therefore, the position of the rotation shaft 41A is determined between the spur cleaner 41 and the spur 4, which are biased by their own weight.
Determined by engagement with 0A and 40B. In other words,
Spur cleaner 41 and spur 40A.

The biasing force for engagement with the spur cleaner 40B is obtained solely from the own weight of the spur cleaner 41.

According to the above configuration, no special member such as a spring is required to generate the biasing force, and the accuracy of the diameter of the spur cleaner 41 is improved because the cleaner 41 is stopped on any circumference. They do not need to be very expensive, and the cost for these configurations can be kept low.

By the way, the above-described spur and cleaner configuration is effective when the relationship between the positions of the three axes and the weight of the cleaner is within a predetermined range. In other cases, for example, when the spur 40B is rotationally driven by the recording paper as the recording paper is conveyed, the rotation causes the spur cleaner 41 to float up, resulting in poor engagement between the spur cleaner and the spur. There is. In such a case, the ink adhering to the spur 40B may not be sufficiently absorbed and may stain the recording paper conveyed later.

An example of a configuration that addresses the above-mentioned points is shown in FIG.

FIG. 9 is a diagram similar to FIG. 8. As shown in FIG. 9, the shaft hole 42C has an elongated hole shape that is slidably and rotatably fitted into the rotation shaft 41A. Parallel lines in the elongated direction of the elongated hole shape each form a part of the circumference concentric with the spur 40A. Further, the positional relationship between the spur 40A and the spur cleaner 41 is determined so that there is a predetermined amount of overlap in their engagement. That is, the spur 40A and the spur cleaner 41
In the engagement with the cleaner 41, the teeth of the spur 40A sink into the surface of the cleaner 41.

According to the above configuration, first, by having a predetermined amount of overlap in engagement, a predetermined engagement state can be obtained even if the precision of the diameter of the cleaner 41 is not so high (even if the precision of the diameter of the cleaner 41 is not so high).

Furthermore, by making the shaft hole 42G into a predetermined long and large shape, the rotation of the spur 40A moves the spur cleaner 41 to the spur 40B.
A force is generated that urges the spur cleaner 41 and the spur 40.
A predetermined amount of overlap can also be caused in the engagement with B. As a result, the spur cleaner 41 and the spur 40A,
By configuring the above-mentioned pattern with 40B, the load on the entire system can be reduced compared to the case where they are simply configured to overlap. Also, spurs 40A, 40
No matter which of the spurs B is driven, the elongated hole shape prevents the spur cleaner 41 from lifting up.

Also in this configuration, the cleaner 41 functions as an idler. As a result, the spur 40B also rotates with the rotation of the paper discharge roller 4 and does not stop rotating during conveyance of the recording paper, so that the recording paper is not significantly soiled due to the spur stopping.

In the configuration shown in FIG. 9, the platen 7 of the spur 40B is
The position with respect to the structure is different from that shown in FIG. That is, as shown in FIG. 8, the platen 7 has a step-like shape from a predetermined position on the downstream side of the position facing the recording head 1. The spur 40B shown in FIG. 9 is positioned so that its teeth penetrate into this depressed portion by a maximum of about 1.5 mm. As a result, the recording paper conveyed on the platen 7 is transported to the recording head 1.
A portion downstream of the portion facing the recording head 1 is shifted in a direction away from the recording head 1 . This shift and the tension generated in the recording paper due to this shift can prevent the recording paper from floating, curling, etc. in the vicinity of the recording head 1.

FIG. 1O is a perspective view of the vicinity of the carriage of the apparatus according to this example.

Here, reference numeral 110 denotes a plurality of ejection ports opened on the surface facing the recording medium, a liquid path communicating with the ejection ports, an ejection energy generating element such as an electrothermal converter disposed corresponding to the liquid path, and each This head chip is provided with a common liquid chamber that communicates with the liquid path and supplies ink. 120 is the head chip 110
This is a head wiring board provided with a wiring section for supplying power to the ejection energy generating element of the head, and the end thereof is connected to the connector 1.
26 and Toshishita. 130 is a support substrate that supports the Herad chip 110 and the head wiring board 120. The recording head 1 having such a configuration is attached to the carriage 2 in the direction indicated by arrow V in the figure.

In the carriage 2, a carriage main body 210 includes a side support plate 212 for supporting the side surface of the head support substrate 130, a bin 214 serving as a rotation axis of the head cover 250, and the like. Reference numeral 230 denotes a connector board having a connector section 9 that is coupled to the connector 126 of the head 1, a connector section that is coupled to a flexible cable for transmitting and receiving signals between the control sections of the main body of the recording apparatus, and the noise reduction resistor, etc. 12 and the carriage body 210
This is a connector slider that is slidably provided in the direction F in the figure.

The head cover 250 protects the recording head 1, particularly its wiring board 120, from accidental contact by an operator's hand, etc., and is rotatable around the bin 214 in a direction to cover the recording head 1 and a direction to open the recording head 1. be. The head cover 250 and the connector slider 230 are engaged, and as the head cover 250 rotates, the connector slider 230
By moving the connector slider 2 in the F direction,
30 and the connector 126 of the head I are connected/separated. In addition, the protrusion 252 of the head cover 250
When coupled to the cover fastener 216 of the main body 210,
A recording head 1 is fixed to a carriage 2.

Next, the manner in which the recording head 1 is fixed to the carriage 2 will be explained.

FIGS. 11(A) and 11(B) are a side sectional view and a plan view showing the carriage 2 with the recording head 1 attached, with the head cover 250 and connector slider removed.

Here, 218 is a spring member provided integrally on the carriage main body 210 protrudingly provided for temporarily fixing the recording head 1, and latches the attached recording head 1 by a claw 218A at the tip thereof. Reference numeral 219 denotes a locking portion for fixing the lower portion of the recording head 1, and numeral 220 denotes a locking portion for fixing the recording head 1 from front to back, which engages with a protrusion 132 provided integrally on the support substrate 130. Reference numeral 221 denotes two side surface fixing protrusions provided on the side support plate 212 at positions that engage with the upper side surfaces of the recording head 1;
Reference numeral 222 designates a side surface fixing protrusion provided at a position to engage with the lower side surface. A spring member 223 projects from the carriage body 210 opposite to the protrusion 222, and biases the recording head 1 against the protrusion 222 when the recording head 1 is attached.

In FIG. 11(B), 228 is a rail for sliding the connector slider 230, and 229 is a protrusion for preventing the connector slider from falling off.

Further, 227 is a groove portion in which a head side end portion of an ink supply tube communicating with an ink cartridge 27, which will be described later, is arranged.

12(A) and 12(B) are a side sectional view and a plan view showing the state of the carriage when the head 1 is covered with the head cover 250, with the connector slider 230 removed for simplicity.

Here, 254 is the bin 2 provided in the carriage body 210.
14, and for rotating the head cover 250 about the pin 214 when engaged. 256 urges the side surface of the recording head 1 to support the side support plate 2;
A spring member 257 is used to press the recording head 1 against the protrusion 221 of the head cover 250, and is a side fixing spring member protruding downward from the upper surface of the head cover 250. This is a support portion protruding from the head cover 250.

259 is a head cover 25 for urging the recording head 1 downward and pressing it against the lower fixing locking part 219 when the head cover protrusion 252 is engaged with the cover retainer 216.
This is the upper fixing protrusion provided at 0. Further, 262 is a projection that engages with a connector slider 230, which will be described later, and moves this as the cover 250 rotates.

FIG. 13 is an explanatory diagram of the fixing or positioning state of the recording head 1 with the above configuration.

As is clear from the figure, the recording head 1 has a head cover 2
Spring member 256 provided at 50 and carriage body 21
It is urged toward the side support plate 212 side by a spring member 223 provided at 0, is pressed by a pair of protrusions 221 and 222, and is supported at these three points, so that it is oriented in the left-right direction of the recording head 1, that is, perpendicular to the drawing. Fixation and positioning are achieved without directional displacement or falling.

Further, the recording head 1 is fixed to the lower part fixing portion 21 of the carriage body 210 by the protrusion 259 of the head cover 250.
9, thereby fixing and positioning the recording head 1 in the vertical direction. Furthermore, the protrusion 1 of the head 1
The recording head 1 is fixed or positioned in the front-rear direction by the locking portions 220 of the carriage body 210, which are arranged at positions sandwiching the connector 32 between the connector portions 9 provided on the connector slider 230 and the head-side connector, which will be described later. Connector slider 23 for coupling with 126
Since the recording head 1 is urged forward by the movement of
Therefore, the fixation and positioning state in the front-rear direction is ensured.

FIG. 14 (A), (B) and (C) are, respectively,
They are a side sectional view showing a head cover 250 in an open state, a side sectional view showing a closed state, and a plan view in a closed state.

Here, 12 is the above-mentioned connector board, 9 is a connector that can be connected to the connector 126 of the recording head 1, and 232 is a connector that is connected to a flexible cable for electrically connecting to the control section of the main body of the apparatus. Reference numeral 234 denotes an upright portion formed with a cam portion 236 that engages with the connector slider moving projection 262.

First, with the head cover 250 open, the recording head 1 is installed as described above, and necessary operations such as connecting the ink supply system are performed. Before or after that, Figure 14 (A)
As shown in FIG. 2, the connector slider moving protrusion 262 of the head cover 250 is engaged with the cam portion 236 of the connector slider rising portion 254, and the bottle holder is inserted into the portion 254.
is engaged with the bin 214 of the carriage body 210. In this state, the head cover 250 can rotate around the bin 214, and as the head cover 250 rotates, the protrusion 262 can slide relative to the cam portion 236 while maintaining its engagement.

Note that in this state, the connector slider 230 is in a retracted position with respect to the recording head 1, so the connector 9 is not engaged with the connector 126.

When the head cover 250 is rotated clockwise in the figure from the state shown in FIG. 14(A), the protrusion 262 also rotates around the bottle 214. The slider 230 is the recording head 1
It will be moved to the side.

14(B) and (C) in which the head cover 250 is completely closed and the protrusion 252 of the head cover 250 is engaged with the cover catch 216 of the carriage body 210.
In the state shown in FIG.
is engaged with the connector 126 of the recording head 1, and an electrical connection is established. Further, the recording head 1 is fixed in this state as described above.

In the above configuration, the connector portions can be easily connected by simply closing the head cover 250, which serves as a protective cover for the recording head 1, from an open state. On the other hand, when the head cover 250 is opened, the connector section comes off, making it easier to remove the recording head 1. Furthermore, the operating part used when rotating the head cover 250 is the part indicated by the reference numeral 250A in FIG. 14(A). Cam part 23
Since the distance to the engaging part 6 is smaller, the operator can rotate the head cover 250 with less force, and at the same time can apply a large force to the connector 9 to rotate the head cover 250.
It can be connected and disconnected from the connector, allowing reliable connection and disconnection.

Furthermore, since the recording head 1 is fixed and unfixed as the head cover 250 is operated, not only is it extremely easy to fix or position the head 1, but also easy to remove it. Furthermore, when the head cover 250 is closed, the wiring board 120 of the head 1 is connected to the first
As shown in Fig. 4 (C), this part cannot be easily touched because it is covered by the head cover 250, and if contact is made to this part, the electrical connection is broken. Therefore, damage to the recording head 1 can be prevented.

In addition, if the electrical connection is made by inserting the recording head from above in consideration of operability such as attaching and detaching the recording head, it is convenient to arrange the connector section on the bottom side. However, in order to protect the connector from leakage of ink from the joint of the ink supply system, it is effective not to arrange the connector on the bottom side of the carriage. According to the configuration according to this example, the connector portion can be reliably protected from ink leakage without sacrificing the operability of attaching and detaching the recording head 1.

Next, the configuration of the ink cartridge 27 according to this example and the mounting section on the main body side in which the ink cartridge 27 is mounted will be described.

FIGS. 15(A) and 15(B) show an example of the configuration of the mounting portion on the main body side.

First, in FIG. 15(A), 302 is a cartridge insertion portion into which the ink cartridge 27 is inserted.

304 is a plate spring contact 306A, 30 as a means for reading information provided on the ink cartridge 27;
6B, and is assembled into the insertion section 302 by engaging the latch section 308 and the hole section 310 of the insertion section 302. 312 is a contact 306A, 30
This is a connector for connecting 6B and the main body control section.

Reference numeral 314 denotes a hollow needle member that enters the inside of the supply ink storage bag housed in the ink cartridge 27, and has an ink introduction hole 316 at its tip.

An ink supply tube is attached to the other end of the needle 314, and the tube is further connected to a common liquid chamber in the head chip 110 provided in the recording head 1. Note that a remaining ink amount detection means can be provided in the middle of this ink supply system.

318 is a waste ink pipe, which is connected to ink cartridge 2.
7 and introduces waste ink into the ink absorber housed therein. This waste ink is, for example, ink discharged in the ink supply system or ink refresh processing in the common liquid chamber, or ink discharged in recovery processing.

Reference numeral 320 denotes a click as a fastener for the ink cartridge 27, and one click is provided on each side of the insertion portion 302.

This click 320, as shown in FIG. 15(B),
When the cartridge 27 is inserted, the engaging portion 322 elastically bends as it engages with the side surface of the cartridge 27, so that the cartridge 2
7 is inserted, and when the recess 332 of the cartridge 27 reaches the engaging portion 322, the engaging portion 322 returns to its original shape, thereby holding the cartridge 27 in that position.

FIG. 16 shows an example of the configuration of the ink cartridge 27 according to this example.

Here, 340 is an ink bag containing supply ink, and is provided with a stopper 342 made of, for example, rubber. The needle 314 is inserted into the stopper 342 and penetrates further inward to establish ink communication.

344 is an ink absorber that receives the above-mentioned waste ink.

FIG. 17 is an explanatory diagram showing various parts that interconnect the ink cartridge 27 and the main body side. Here, 346 is a wiring pattern provided on the top surface of the ink cartridge 27, and the contact 306A-3 is connected via this wiring pattern 346.
The main body control section can detect whether an ink cartridge is attached or not depending on the conduction/non-conduction between 06B and 06B. Further, by forming a resistance pattern having a resistance value determined according to the color, density, etc. of the ink containing this pattern, the main body control section can also read the information.

In this example, as the ink cartridge 27 is inserted, the needle 314 penetrates the stopper 342 and the hole 316 reaches the inside of the ink bag 340, thereby establishing an insertion position (■) where ink communication is established, a contact point 306A, The insertion position (■) where 306B is connected to the wiring pattern 346, the click 320 and the recess 332 are engaged, and the ink cartridge 2
The positions and dimensions of each coupling portion are determined so that the insertion position (■) where 7 is held is located in this order in the insertion direction.

That is, when the operator inserts the cartridge 27, the needle 314 first enters the inside of the ink bag 340, and as the operator inserts it further, the contacts 306A and 306B are connected to the resistance pattern 346, and only when the cartridge 27 is further inserted. The click 320 and the recess 332 are adapted to engage with each other. In this example, since the ink cartridge 27 also accommodates waste ink, it is desirable that the waste ink vibrator 31g is also located inside the ink cartridge 27 at the 5th position (3).

The above positional relationship is shown in FIG.

In FIG. 18, ■ is the position where the ink cartridge 27 finally hits in the insertion direction, and the range from ■ to ■ is the range in which the cartridge 27 moves in the holding position due to the play between the click 320 and the recess 332; Alternatively, this is the range from when the click 320 and the recess 332 are engaged to when the cartridge 27 is further inserted and hits the innermost part of the insertion section 302 .

If such a positional relationship is not adopted, a problem as shown in FIG. 19 will occur.

In other words, in the relationship shown in FIG. 3A, even if the cartridge is held, information regarding the cartridge cannot be read through the contacts 306A and 306B, so the control section of the main body of the apparatus may determine that the cartridge is not inserted. be. In the relationship shown in FIG. 3B, contact connection is made prior to ink communication, so the main body control unit determines that the cartridge is installed and starts a predetermined operation, causing air to enter the ink supply system from the needle 314. There is a risk that it may be taken in. Same figure (
The same holds true for relationship C), and furthermore, if the operator cancels the insertion operation after confirming the click sound, full ink communication will not be obtained.

Due to the relationships shown in (D) and (E) of the same figure, the needle 314 may come out within that range even though the cartridge is being held, or the connection of the contacts may become unstable.

On the other hand, according to the relationship shown in Fig. 18, ink communication, contact connection, and cartridge retention are performed in this order when the cartridge is inserted, so the operator can simply confirm retention with the cartridge by making a click sound, etc. do it.

Furthermore, even if the main body control section immediately starts operating in response to a contact connection, there will be no inconvenience such as air being taken into the ink supply system, and conversely, even if the cartridge 27 is pulled out while the main body control section is operating. Since the main body control section can detect this before the ink communication is cut off, similar inconveniences will not occur if the operation is stopped.

FIG. 20(A) relates to a further improvement of the above configuration. In the illustrated example, the wiring pattern is divided into two, and the pattern on the front side in the cartridge insertion direction is connected to the contact 306A-3.
A pattern 346A that short-circuits between 06B and a resistor pattern 346B having a resistance value determined according to the ink color, density, etc. is used as the pattern on the rear side.

FIG. 20(B) shows the range where ink is communicated in such a configuration, and the contact points 306A and 306B are in the pattern 34.
The relationship between the range in contact with 6A, the range in contact only with pattern 346B, and the range in which the cartridge is held is shown.

Here, ■ is the limit position where ink communication is established as described above, ■ is the limit position where the cartridge 27 is held, and ■
is the innermost position where the cartridge 27 hits.

Also, @ contacts 306A and 306B are pattern 346
The limit position on the front side in the insertion direction where it contacts A and is short-circuited,
This is the limit position on the front side in the insertion direction where the O-fold contacts 306A and 306B come off the pattern 346A and come into contact only with the pattern 346B, and the resistance value thereof is read. Here, the position O is at or near the position (2), and in this example, the click 320 and the recess 332 are disengaged, and the cartridge 27 is easily removed. It is desirable to do so.

The relationship between each position is as shown in the figure, and the same effect as in the case of FIG. 18 can be obtained, but in this example, an even better effect can be obtained by performing the following operation.

FIG. 21(A) shows the main parts of the control system according to this example. Here, 400 is a main body control unit, which has a CPU for controlling the entire apparatus in addition to the processing shown in FIG. It can be in the form of a microcomputer. 410 is a detector that detects the resistance value between the contacts 306A and 306B, and when the resistance value is "0"
If , it means that the contacts are shorted by the above pattern 346A, and if it is infinite, it means that the ink cartridge 27
A predetermined value indicates that the ink cartridge 27 is not installed, and a predetermined value indicates that the ink cartridge 27 is correctly held. Reference numeral 420 denotes a notification unit capable of displaying messages, etc., outputting means, such as audio, or a combination thereof. Also,
3 is a signal to stop the operation of each part.

FIG. 21(B) shows an example of the operating procedure of this example, and this procedure can be started not only when the power of the apparatus is turned on or when the ink cartridge 27 is replaced, but also at an appropriate timing during the recording operation.

When this procedure is started, a resistance value is first read in step S1. If this is infinite, it means that the cartridge 27 is not installed, so the process proceeds to step S3, where the operation of each part is held in a stopped state, and in step S5, a notification is issued to prompt the operator to insert the cartridge 27. conduct.

On the other hand, if the resistance value is "0", the cartridge 27 is in a state where it is easy to remove, so the process advances to step S7, and after stopping the operation of each part, the operator is asked to ensure that the cartridge 27 is securely held in step S9. prompt for operations to ensure that the

Furthermore, if the resistance value is a predetermined value, the cartridge 27 is already securely held, so information related to the cartridge (ink color, etc.) corresponding to the resistance value is recognized, and setting processing corresponding to this is performed. (Step 511).

In other words, if the operator inserts the cartridge 27 but the click 320 and the recess 332 fail to engage, or if the engagement is disengaged for some reason, the cartridge is not retained completely and may not fall out. Easy to occur. In such a case, by connecting the contacts 306A and 306B to the pattern 346A, the main body control unit 400
cannot read the unique information of the cartridge 27. Therefore, the main body control unit 400 recognizes such a situation, turns off the device operation, and prompts the operator to insert the cartridge 27 securely. Therefore, it is possible to notify the operator of the danger of the cartridge 27 falling out of the apparatus.

In addition, if the above-mentioned positional relationship can basically be established for the supply ink communication, the reading position of cartridge-related information, and the cartridge holding position, an appropriate configuration can be adopted for the cartridge and its insertion part, etc. Of course you can. For example, cartridge retention may not necessarily be by clicks and recesses.

In addition, the reading of information related to the ink cartridge is not done electrically (for example, it can also be done optically.Furthermore, on the upper side, waste ink is also introduced into the cartridge, but the cartridge is It may also be one that only supplies ink.

(Others) The present invention brings about excellent effects particularly in a bubble jet type recording head and recording apparatus among inkjet recording types.

This is because such a system can achieve higher recording density and higher definition.

As for typical configurations and principles thereof, it is preferable to use the basic principles disclosed in, for example, US Pat. No. 4,723,129 and US Pat. No. 4,740,796. This method can be applied to both the so-called on-demand type and continuous type, but especially in the case of the on-demand type, it is necessary to arrange the liquid (ink) in accordance with the sheet and liquid path that hold it. The electrothermal converter that is
By applying a single drive signal that corresponds to the recorded information and causes a rapid temperature rise exceeding nucleate boiling, the electrothermal transducer generates thermal energy, causing film boiling on the heat-active surface of the recording head. This is effective because it causes bubbles in the liquid (ink) that correspond to this drive signal in pairs.The growth and contraction of these bubbles causes the liquid (ink) to flow through the ejection opening. It is ejected to form at least one drop.If this drive signal is in a pulse shape, bubble growth and contraction will occur immediately and appropriately.
Particularly responsive liquid (ink) ejection can be achieved,
More preferred. This pulse-shaped drive signal is described in U.S. Pat. Nos. 4,463,359 and 4,345,262.
Those described in the specification are suitable. Furthermore, if the conditions described in US Pat. No. 4,313,124 concerning the invention regarding the temperature increase rate of the heat acting surface are adopted, even more excellent recording can be performed.

The configuration of the recording head includes, in addition to the combination configuration of ejection ports, liquid paths, and electrothermal converters (straight liquid flow path or right-angled liquid flow path) as disclosed in the above-mentioned specifications, a heat acting section. The present invention also includes configurations using US Pat. No. 4,558,333 and US Pat. No. 4,459,600, which disclose configurations in which the wafer is placed in a bending region. In addition, Japanese Patent Application Laid-Open No. 1989-5 discloses a configuration in which a common slit is used as a discharge part of a plurality of electrothermal converters.
No. 9-123670 and Japanese Patent Application Laid-Open No. 59/1989 which discloses a configuration in which a discharge portion is made to correspond to an opening that absorbs pressure waves of thermal energy.
The effects of the present invention are also effective even if the structure is based on the publication No.-138461. In other words, regardless of the form of the recording head, recording can be performed reliably and efficiently.

Further, it is preferable to add recovery means for the recording head, preliminary auxiliary means, etc., which are provided as a configuration of the recording apparatus, to the present invention, because the effects of the present invention can be further stabilized. Specifically, these include capping means for the recording head, cleaning means, pressure or suction means, preheating means using an electrothermal transducer or another heating element, or a combination thereof; It is also effective to perform a preliminary ejection mode in which ejection is performed separately from printing in order to perform stable printing.

In addition, regarding the type and number of recording heads to be mounted, for example, in addition to one type that corresponds to a single color ink, a plurality of recording heads can be installed to correspond to multiple inks that have different recording colors and densities. It may be something that can be done.

In addition, in addition to being used as an image output terminal for information processing equipment such as a computer, the inkjet recording apparatus of the present invention may also take the form of a copying machine combined with a league, etc., or a facsimile machine having a transmission/reception function. It may be something.

[Effects of the Invention] As described above, according to the present invention, the means for fixing or positioning the mounted recording head and the means for electrically connecting the recording head are combined to protect the recording head. The cover is integrated with the cover to be used, and the operation of covering the recording head with the cover fixes or positions the recording head, as well as the electrical connection, and the operation of opening the cover releases these. Joining/
Not only can the release be easily performed, but also the protection of the recording head can be ensured.

[Brief Description of the Drawings] Fig. 1 is a perspective view showing an inkjet recording device according to an embodiment of the present invention with its top cover removed, and Fig. 2 is the same (a perspective view shown with the top cover attached). 3 and 4 are perspective views showing detailed configuration examples of the spur and spur cleaner of the device according to the present example, and FIG. 5 is a cross-sectional view of the spur holder in FIG. 3 seen from the back side. FIGS. 6(A) and (B) are respectively a front view and a side view of the spur of the device according to this example, and FIG. 7 is a modified example of the spur shown in FIGS. 6(A) and (B). 8 is a side sectional view of the apparatus according to the present example, FIG. 9 is a side sectional view showing another configuration example of the inkjet recording apparatus of the present invention, and FIG. 1O is a carriage applied to the apparatus of the present invention. FIGS. 11A and 11B are a side sectional view and a plan view showing the carriage with the recording head attached, with the head cover and connector slider removed; 12(A) and 12(B) are side sectional views and plan views showing the carriage with the recording head and head cover attached, with the connector slider removed, and FIG. 13 is for explaining the fixing or positioning state of the recording head. 14A, 14B, and 14C are a side sectional view showing the carriage with the head cover open, a side sectional view showing the carriage in the same closed state, and a side sectional view showing the carriage in the same closed state, respectively. 15(A) and 15(B) are a perspective view and a partial cross-sectional view showing a configuration example of an ink cartridge mounting portion of an apparatus according to the present invention, respectively, and FIG. 16 is an ink cartridge according to the present example. 17 is a perspective view illustrating each part that interconnects the ink cartridge and the main body side, and FIG. 18 shows the coupling position of each part related to coupling in this example with respect to insertion of the ink cartridge. 19(A) to (E) are explanatory diagrams for explaining the inconveniences that occur when the bonding positional relationship as in this example is not adopted; FIG. 20(A) and (B) are shown in Figures 17 and 18.
21(A) and 21(B) are a block diagram showing a control system for the configuration shown in FIG. 20 and its operation, respectively. 3 is a flowchart showing an example. ...recording head, ...carriage, ...paper ejection roller, ...paper feed roller, ...recording medium (recording paper), ...platen, ...connector, 2 3 4 7 40A . I 2 3 0 1 20 26 30 10 12 14 16 30 32 36 ... Connector board, ... Cap, ... Pump, ... Ink cartridge, 40B ... Spur, ... Spur cleaner, ・...Spur holder, ...Spur shaft, ...Side frame, ...Top cover...Head wiring board, ...Connector, ...Head support board, ...Carriage body, ... Side support plate, ...Cover rotating pin, ...Cover retainer, ...Connector slider, ...Connector, ...Cam part, 250...Head cover 262...Protrusion for moving connector slider , 302...
・Cartridge insertion part, 304... Contact holder, 306A, 306B... Contact, 314... Needle, 318... Waste ink pipe, 320... Click, 332... Recess, 340... Ink bag, 346, 346A, 346B...Wiring pattern. Sin 2 Figure 3 Figure 51 Figure 4 Figure 400EJ Figure 5 CB> Figure 6 Figure 8 (A) Figure 9 Figure 10 Head 71F 770 Figure 11 CB> Figure 13 Figure 12 (B ) Sema! :, J Figure 14 (C) Figure 16 Figure 18 Figure 20 (A) Figure Q CB)

Claims (1)

[Scope of Claims] 1) A recording head that performs recording by ejecting ink onto a recording medium, and a holding member that detachably holds the recording head and scans the recording medium. a cover member provided on the holding member to protect the recording head by covering it when the recording head is attached and to open the recording head when the recording head is removed; a fixing means for fixing the recording head in response to a closing operation of the cover member for covering the recording head; and an electrical connection member provided on the cover member and arranged on an electrical connection member of the recording head and the holding member. an inkjet recording apparatus, comprising: a connecting portion driving means for connecting the two parts according to the closing operation of the cover member. 2) The ink jet recording apparatus according to claim 1, wherein the cover member protects an electrical wiring section of the recording head from contact. 3) The ink jet recording apparatus according to claim 1, wherein the recording head has an element that generates thermal energy as energy used for ink discharge.