MXPA99007918A - Mechanism of bearing and device transporter and device of regis - Google Patents

Abstract

The present invention relates to a bearing mechanism, comprising: a support plate having an opening portion for retaining a bearing, the bearing includes an adjustment portion to be fitted within the opening portion of the plate of support and having an arrow bore into which an arrow is to be inserted, and two tightening portions projecting outward and axially spaced apart from one another, in the adjustment portion for tightening the support plate, from both sides of the support plate, wherein the support plate is provided around the opening portion thereof, with through portions through which one of the tightening portions passes, and wherein the tightening portions tighten the support plate from the inside and the outside, moving the tightening portions from the through portion, by rotating the bearing, after the bearing adjusting portion has been adjusted within the opening portion of the support plate, and a fixing means for fixing a rotation of the bearing in a rotated position, wherein the support plate is tightened by the tightening portions from the inside and outside.

Description

"BEARING MECHANISM AND CONVEYOR DEVICE AND REGISTRATION APPARATUS" BACKGROUND OF THE INVENTION FIELD OF THE INVENTION The present invention relates to a bearing mechanism for retaining an arrow, a conveyor apparatus in which this bearing mechanism is applied to a conveyor portion, and a recording apparatus in which this conveyor apparatus is used to transport a means of transport. registration and an image is formed in the recording medium by a registration head.

RELATED BACKGROUND TECHNIQUE Registration devices having a function such as a printer, a copying machine or a facsimile, or recording devices used as output devices for composite electronic equipment including a computer or a word processor or as output devices for work stations they are designed so that an image is on a sheet to be registered (recording medium) such as a sheet of paper or a thin sheet of plastic based on the image information.

These recording devices can be divided into an ink jet system, a wire dot system, a thermal system, a laser beam system and the like, depending on the recording style. In a serial type recording apparatus having a series scanning system in which the main scan is performed along a direction transverse to the conveyor direction (sub-scan direction) of the sheet to be recorded , the entire image is recorded by a registration means mounted on a movable carriage along the sheet to be registered, repeating the registration of a line made by the main scan and a predetermined quantity sheet feed alternately (transport of inclination). Among the aforementioned recording apparatus, the ink jet type recording apparatus (ink jet recording apparatus) is designed to perform registration by discharging ink from the recording medium (a recording head) towards the sheet that is going to register. This recording device has the advantage that the recording medium can be made easily compact, a fine image can be recorded at high speed, the recording can be made on a simple paper without special treatment, an operating cost is economical, the noise can be Delete due to non-impact registration and the color image can easily be recorded using multiple color inks. Now, the conveyor means of a recording apparatus in accordance with prior technology will be described with reference to Figures 13 to 18. Figure 13 is a front view of this recording apparatus and Figure 14 is a sectional view of the recording device. A sheet feeding portion 503 is fixed to a chassis 508 formed by bending a sheet of metal. The sheet feed portion 503 includes a conveyor cylinder 536 for transporting a sheet P1 and a PE sensor (blade end sensing device) 532. The conveyor cylinder 536 is constituted by winding an elastic material such as a rubber around a surface of a metal arrow and is attached to the chassis 508 by mounting both ends of the metal arrow within the bearings 538, 539 conductors. A tension spring 681 of the conveyor cylinder is positioned between the bearing 538 and the conveyor cylinder 536 to apply a load to the conveyor cylinder 536 during rotation, to thereby provide stable transport. Namely, by pushing the conveyor cylinder 536 through the spring 681, a predetermined load is applied. The conveyor cylinder 536 is fixed in the following manner. First, one end of the metal arrow of the conveyor cylinder 536 is inserted into the bearing 539 and then fixed to the chassis 508. Then, the other end of the metal arrow of the conveyor cylinder 536 is passed through a cut portion. of chassis 508. Then, the tension spring 681 of the conveyor cylinder is fixed and the bearing 538 is adjusted in the chassis 508 while the bearing 538 is inserted into the arrow of the conveyor cylinder 536 from the outside. In this case, a portion 686 of the bearing latch 538 enters a slot portion 661 formed in the transport cylinder 536 so that the transport cylinder 536 is secured in the chassis 508. An assembled condition is shown in FIG. 15B. A plurality of pusher cylinders 537 bump against the conveyor cylinder 536. The clamping cylinders 537 are retained by a guide 530 of the clamping cylinder pivotally mounted on an arrow 530a and pushed by a clamping cylinder spring 531 to urge the clamping cylinders 537 against the cylinder 536 conveyor, thus providing a conveyor force for the sheet P '.

The clamping cylinders 537 are positioned so that they do not cover the entire area of the sheet P 'but are divided to retain only the predetermined scales of the sheet. In this case, the rotation arrow 530a of the guide 530 of the clamping cylinder is fixed to the bearings of an upper guide 533 for rotation. In addition, an inlet of the sheet feed portion 503 to which the sheet P "is conveyed is provided with the upper guide 533 and a plate 534 guiding the sheet PY The upper guide 533 is provided with a lever 535 of the PE sensor to transmit the detection of the front and rear ends of the blade P 'to the PE sensor 532. The plate 534 is positioned by a bearing portion 642 fitted and slidable in the conveyor cylinder 536 to be fixed to the chassis 508, and an arrow 643 of a fastener fixed directly to the chassis 508. Further a recess portion 544 for lowering the sheet for transporting a side edge of the sheet P 'is provided on a reference side of the sheet of the plate 534. With this arrangement, even when the lateral edge of the sheet P 'is deformed or flanged, the side edge of the sheet is prevented from floating by interfering with a carriage 550 or the registration head 507.

The registration head 507 for forming an image based on the image information is placed on one side downstream of the conveyor cylinder 536 in a conveyor direction of the sheet P '. In the aforementioned arrangement, the sheet P 'fed to the sheet feeding portion 503 is guided by the plate 534, the guide 530 of the clamping cylinder and the upper guide 533 to be sent to a pair of cylinders (cylinder 536). conveyor and tightening cylinders 537). In this case, the lever 535 of the sensor PE detects the leading end of the sheet P 'that is being transported, thus determining a printing position of the sheet PY In addition, the sheet P' is transported on the plate 534 by turning the pair of cylinders 536, 537 by an LF motor (not shown). Incidentally, the registration head 507 is an exchangeable ink jet recording head easily formed integrally with an ink tank. In this recording head 507, the heat can be applied to the ink by means of a heater or a similar device. The ink is boiled in the film by heat to cause the growth and contraction of a bubble in order to generate a change in pressure by which the ink is discharged from a nozzle 570 of the registration head 507, thereby forming the image on the sheet P '. In a sheet discharge portion 504, a transmitting cylinder 540 abuts against the conveyor cylinder 536 and further abuts a sheet discharge cylinder 541. Correspondingly, a driving force of the conveyor cylinder 536 is transmitted to the sheet discharge cylinder 541 through the transmitter cylinder 540. In addition, a cylinder 542 abuts against the sheet discharge cylinder 541 to be driven by the rotation of the discharge cylinder 541. The straight cylinder 542 is fixed to a straight stalk 641 of an integral type that is provided on the stage 534. By providing the straight stalk 641 integral with the stage 534 in this manner, since the dimensions of the straight cylinder 542 and the cylinder 541 of Leaf discharge can be controlled within the same piece, a dimensional relationship is stably maintained. In addition, the straight stay 641 has a partially recessed portion 641a. When the head 507 is swapped, the carriage 550 moves upward to the cutout portion 641a to create a space through which the lever of the hook 553 for mounting and dismounting the head 507 can be made to be manipulated.

With the aforementioned arrangement, the sheet P * in which the image was formed in a carriage portion 505, is pressed by a holding point between the sheet discharge cylinder 541 and the straight cylinder 542 to be transported and unloaded towards the tray of sheet discharge (not shown). Nevertheless, the aforementioned technique has the following problems. In securing the transport cylinder 536 to the chassis 508, as shown in Figure 5A and 15B, the slot portion 661 must be formed in the metal arrow of the conveyor cylinder 536 and the fastener portion 686 must be provided in the bearing 538 corresponding to slot 661 (Figure 15A). In this way, the number of manufacturing steps is increased, thus making the manufacturing cost more expensive. In addition, when the fastener 686 is released, the fastener may be damaged, thereby causing a problem with respect to functionality. Further, since the clamping cylinders 537 do not hold down the entire area of the sheet P ', as shown in Figure 16, if the side edge of the sheet P' is warped, the sheet can not enter below the sheet. the downward retention portion 644 of the blade but running above the downward retention portion 644 of the blade, with the result that the side edge of the blade P 'may interfere with the carriage 550 or the head 507 register. In addition, depending on the kind of the sheet P 'or surrounding environment such as temperature and humidity, a rear end of the sheet P' may be floating after it discharges. In this case, if the trailing end of the sheet P 'is squeezed between the straight cylinder 542 and a straight cylinder cleaner 543 or a straight cylinder fixing portion 641 of the platen 534, a poor sheet discharge or sheet will occur P 'will be damaged by the straight cylinder 542 (Figure 17).

COMPENDIUM OF THE INVENTION The present invention has as object to eliminate the conventional inconveniences mentioned above, and an object of the present invention is to provide a bearing mechanism wherein a portion of the groove in an arrow and a sear portion in a bearing corresponding to the portion of slots are not required and can improve the production efficiency and operating capacity, and a conveyor device having this bearing mechanism and where, when a driven cylinder is not placed in an entire area of a sheet to be transported, a shore The side of the leaf to be transported can be correctly directed so as not to damage the leaf to be transported after the leaf was discharged, and a recording device having this conveyor device. To achieve the aforementioned object, the present invention provides a bearing mechanism comprising a support plate having an opening portion for retaining a bearing, and the bearing includes an adjustment portion to be adjusted in the opening portion of the bearing. the support plate and having an arrow bore where it is to be inserted into an arrow and two tightening portions protrude outward and axially spaced from one another by a distance corresponding to a thickness of the support plate in the portion of adjustment, and wherein the support plate is provided around the opening portion thereof, with recessed portions through which the tightening portions can pass, and the tightening portions have fixing means for fixing the rotation of bearing in a position that is rotated where the support plate is tightened by the tightening portions, from the inside and the outside, to pressing the support plate from the inside and outside by moving the tightening portions from the recessed portions by rotating the bearing after the bearing adjusting portion was placed within the opening portion of the support plate. The fastening means may comprise a protrusion as long as a clamping portion of the bearing and the support plate and the depression or hole portion provided in the other bearing clamping portion and the support plate. One of the two tightening portions protruding outward may have a configuration greater than a configuration of the opposite tightening portion, and an opening greater than the configuration of the other tightening portion that may be provided in the opposite position. The bearing may have a handle portion. Further, in a conveyor apparatus having a conveyor cylinder and cushion mechanisms positioned on either side of the conveyor cylinder, at least one of the bearing mechanisms may comprise the aforementioned bearing mechanism. Further, in a conveyor apparatus having a conveyor means comprising a conveyor cylinder and a driven cylinder opposite the conveyor cylinder in the interposition of a conveyor path and which is divided into a plurality of cylinder portions along an axial direction, a guide member for holding down a side edge and a sheet to be transported can be placed in a position where the driven cylinder is not positioned and the side edge of the sheet to be transported is passed. The conveyor means may have a retention portion of the driven cylinder for retaining the driven roller and the guide member may be provided in the retention portion of the driven cylinder. The guide member may have a same radius as that of the driven cylinder in a sectioned configuration at a portion of the fastening point between the conveyor cylinder and the driven cylinder may have a tapered configuration evenly spaced from the conveyor path from the portion of the point fastening to one side upstream of the conveyor path. further, in a conveyor apparatus having a sheet discharge cylinder and a straight cylinder opposite the sheet discharge cylinder with the interposition of a conveyor path, a protection member to prevent a sheet from being held up can be placed between the path conveyor and straight cylinder on one side downstream of the conveyor path. Protective members may be provided in a fixing portion of the straight cylinder and may be placed at least outside of both straight cylinders out of the straight cylinders. Further, in a recording apparatus having a recording head for forming an image on a recording medium such as a sheet to be transported, a carriage for holding the recording head and capable of scanning in a main scanning direction, a guide means for guiding the carriage in the main carriage scan and a conveyor means for transporting the registration means in a sub-scan direction, the aforementioned transport apparatus can be provided. Further, in a recording apparatus having a recording head for forming an image in a recording medium such as a sheet to be transported, a carriage for holding the recording head and capable of scanning in a main scanning direction, a guide means for guiding the carriage in the main carriage scan and a conveyor means for transporting the registration means in a sub-scan direction, the conveyor means may comprise a conveyor cylinder, a driven cylinder opposite the conveyor cylinder and it divides into a plurality of cylinder portions along an axial direction, a platen for defining a guide surface during registration and a retention member down which is provided on the platen and which is adapted to prevent a lateral edge of a float record means, and a guide member for holding down the side edge of the record means can be placed on a p where the driven cylinder is not positioned and the side edge of the sheet to be transported is passed and the guide member may consist of the holding member downward.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a front view of a recording apparatus according to a first embodiment of the present invention; Figure 2 is a sectional view of the recording apparatus according to the first embodiment; Figures 3A, 3B and 3C are views for explaining a configuration and condition of fixing a bearing in the recording apparatus according to the first embodiment, wherein Figure 3A is a left side view of the bearing, Figure 3B is a front view of the bearing and Figure 3C is a right side view of the bearing; Figures 4A and 4B are views for explaining a method for fixing the bearing in the recording apparatus according to the first embodiment, wherein Figure 4A is a view showing a condition in which the bearing fits on a plate support, and Figure 4B is a view showing a condition wherein the bearing is rotated and fixed after adjusting; Figure 5A is a view for explaining a configuration of an arrow of a conveying cylinder of a conventional recording apparatus, and Figure 5B is a view for explaining a configuration of an arrow of a conveying cylinder of the recording apparatus in accordance with the first embodiment of the present invention; Figure 6A is a plan view showing the main parts in a sheet feeding portion of the recording apparatus according to the first embodiment, and Figure 6B is a sectional view taken along the line 6B-6B in FIG. Figure 6A; Figure 7 is a view for explaining the action of a guide portion with respect to a retention member down the sheet of the recording apparatus according to the first embodiment; Figure 8 is a view for explaining the protection means to prevent the straight cylinders from retaining a sheet in the recording apparatus according to the first embodiment.

Figures 9A, 9B and 9C are views for explaining a configuration and condition of fixing the bearing in a recording apparatus in accordance with a second embodiment of the present invention, wherein Figure 9A is a left side view of the bearing, Figure 9B is a front view of the bearing and Figure 9C is a right side view of the bearing; Figure 10 is a view for explaining the action of a guide portion with respect to a retention member downwardly of the sheet of a recording apparatus in accordance with a third embodiment of the present invention; Figure 11 is a view for explaining the action of a guide portion with respect to a retention member downwardly of the sheet of a recording apparatus in accordance with a third embodiment of the present invention; Figure 12 is a view for explaining the means of protection for preventing straight cylinders from retaining a sheet in a recording apparatus in accordance with a fourth embodiment of the present invention. Figure 13 is a front view of a conventional recording apparatus; Figure 14 is a sectional view of the conventional recording apparatus; Figures 15A and 15B are views for explaining a configuration of a bearing in a conventional recording apparatus, wherein Figure 15A is a side view of the bearing and Figure 15B is a front view of the bearing; Figure 16 is a view for explaining a mechanism in which a recording means passes over an upper surface of the retention member down the sheet in a conventional recording apparatus. Figure 17 is a view for explaining a mechanism of a conventional recording apparatus wherein straight cylinders hold up a sheet; and Figure 18 is a plan view of a platen unit in a conventional technique.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES The present invention will now be explained in relation to the modalities thereof with reference to the accompanying drawings. (First mode) A first embodiment of the invention will be described with reference to Figures 1 to 8. A recording apparatus 1 having an automatic sheet feeder comprises a portion 2 of sheet supply, a sheet feed portion 3, a sheet discharge portion 4, a carriage portion 5 and a cleaning portion 6. Now, these portions will be described briefly in order. Incidentally, Figure 1 is a front view of the recording apparatus 1 and Figure 2 is a sectional view of the recording apparatus 1. First, the supply portion of ho's will be explained. The sheet supply portion 2 includes a base 20 to which a pressure plate 21 for stacking the sheets P and a rotary supply member 22 for attaching the sheet P are secured. A movable side guide 23 is movably mounted on the plate 21 for regulating a stacking position for the sheet P. The pressure plate 21 can be rotated about a rotary arrow connected to the base 20 and pushed towards the rotary supply member 22 by a spring 24 of the plate Pressure. A separation pad 25 formed of material having a high coefficient of friction such as synthetic skin to prevent double feeding of the sheets P, is provided in a portion of the pressure plate 21 opposite the rotary delivery member 22.

In addition, the base 20 is provided with a pawl 26 for covering a corner of the stack of the sheet and for separating the sheets P one by one, a portion 27 integrally formed with the base 20 for separating the sheets (which can not be removed). separated by the separation latch 26) such as the thick sheets, and a release cam 29 for releasing the stop between the pressure plate 21 and the rotary supply member 22. In the arrangement mentioned above, in a standby condition, the pressure plate 21 is lowered to a predetermined position by the release cam 29. In this condition, the stop between the pressure plate 21 and the rotary supply member 22 is released. When a driving force of the conveyor cylinder 36 is transmitted to the rotary supply member 22 and the release cam through the gears and the like, since the release cam 29 is separated from the pressure plate 21, the pressure plate 21 it rises to bump against the blade P against the rotating supply member 22. When the rotary supply member 22 is rotated, the sheets P are picked up to start the supply of sheets and the collected sheets P are separated one by one, by the separation latch 26, and the separate sheet is sent to the portion 3 of sheet feeding. In this case, regardless of the sheets having low stiffness such as plain papers, the release latch 26 is fixed while serving to separate the sheets one by one. On the other hand, with regard to the sheets having high stiffness, such as the thick papers, the sheets are separated one by one while the separating fastener 26 moves. The rotary supply member 22 and the release cam 29 are rotated until the sheet P is fed to the sheet feed portion 3. Then, the waiting condition in which the stop between the sheet P and the rotary supply member 22 is released is established again, and the driving force from the conveyor cylinder 36 is not transmitted. Then, the sheet feeding portion will be explained. The sheet feeding portion 3 is fixed to a chassis 8 formed by bending a sheet of metal. The sheet feed portion 3 includes a conveyor cylinder 36 for transporting the sheet P and the sensor 32 PE. The conveyor cylinder 36 is formed by winding an elastic material such as rubber around a surface of a metal arrow and is attached to the chassis 8 by mounting both ends of the metal arrow within the conductive bearings 38, 39. A conveyor cylinder tension spring (elastic member) 381 is positioned between the bearing 38 and the conveyor cylinder 36 to apply a load to the conveyor cylinder 36 upon rotation to thereby provide stable transport. Namely, by pushing the conveyor cylinder 36 by the spring 38, a predetermined load is applied. A plurality of driven pressing cylinders 37 abuts against the conveyor cylinder 36. The clamping cylinders 37 are retained by a guide 30 of the clamping cylinder and are pushed by a spring 31 of the clamping cylinder to urge the clamping cylinders 37 against the conveyor cylinder 36, thereby providing a driving force for the sheet P The clamping cylinders 37 are positioned so that they do not cover the entire area of the sheet P but cover only the predetermined divided scales of the sheet. Accordingly, in areas where the clamping cylinders are not in place, guides 302 are provided which extend from the clamping cylinder guide 30 thus preventing the sheet P from floating. In this case, an arrow of rotation 30a of the cylinder guide 30 and tighten the bearings of an upper guide 33 for rotation. In addition, an inlet of the sheet feed portion 3 to which the sheet P is transported is provided with the upper guide 33 and a plate 34 guiding the sheet P. The upper guide 33 is provided with a lever 35 of the PE sensor to transmit the detection of the front and rear ends of the sheet P to the sensor 32 PE. The plate 34 is positioned by the bearing portions 342 fitted and slidable in the conveyor cylinder 36 to be fixed to the chassis 8, and a fixing arrow 343 fixed directly to the chassis 8. Further, a downward holding portion 344 of the sheet for covering a side edge of the sheet P is provided on a reference side of the sheet of the plate 34. With this arrangement, even when the side edge of the sheet P is deformed or flanged, the side edge of the sheet is prevented from floating as to interfere with a carriage 50 or a registration head 7. The registration head 7 for forming an image based on image information is placed on one side downstream of the conveyor cylinder 36, in a transport direction of the sheet P. In the arrangement mentioned above, the sheet P fed into the portion 3 sheet feeding is guided by the plate 34, the guide 30 of the clamping cylinder and the upper guide 33 to be sent to a pair of cylinders (cylinder 36 conveyor and retention cylinders 37). In this case, the lever 35 of the sensor PE detects the leading end of the sheet P that is being transported, thus determining a printing position of the sheet P. In addition, the sheet P is transported on the plate 34 by rotating the pair of cylinders 36, 37 by means of an LFM motor (driving means) LFM. Incidentally, the registration head 7 is an interchangeable ink jet recording head easily integrally formed with an ink tank. In this recording head 7, the heat can be applied to the ink by means of a heater or similar means. The ink is first boiled in the ink by the heater to cause the growth and contraction of a bubble to generate a change in pressure by which the ink is discharged from a nozzle 70 of the registration head 7, thereby forming the picture on the sheet Q. Then, the portion of cars will be explained. The carriage portion 5 includes the carriage 50 where the registration head 7 is mounted. The carriage 50 is supported by a guide arrow 81 to cause reciprocal scanning of the carriage along a direction perpendicular to the conveyor direction of the sheet P, and a guide rail 82 for retaining a rear end of the carriage 50 so as to to maintain a clearance between the registration head 7 and the sheet P. Incidentally, the guide arrow 81 is fixed to the chassis 8. The guide rail 82 is integrally formed with the chassis 8. Provides the guide rail 82 formed integrally in the chassis 8, the number of parts is reduced and the number of fixing steps is also reduced thereby reducing the manufacturing cost. In addition, since the rigidity of the chassis is increased by bending the guide rail 82, the resistance with respect to reliability is improved. Incidentally, if conventional strength is adequate, since a thickness of the metal sheet forming the chassis 8 can be reduced, the cost of the apparatus is further reduced. The carriage 50 is driven by the motor 80 of the carriage fixed to the chassis 8, through a synchronization belt 83. The timing belt 83 is supported by an intermediate pulley 84, and the tension in the timing belt is maintained by this intermediate pulley. The carriage 50 is provided with a flexible substrate 56 for transmitting a head signal from an electrical substrate 9 to the registration head 7.

In the aforementioned arrangement, when the image is formed on the sheet P, the sheet P is conveyed to the image-forming hillera position (position in the conveyor direction of the sheet P) by a cylinder stop 36, 37 and the carriage 50 moves towards the position of the image forming column (position in the direction perpendicular to the conveyor direction of the sheet) by the motor 80 of the carriage, from which the registration head 7 is opposite to a position image maker Then based on the signal from the electrical substrate 9, the registration head 7 discharges the ink towards the sheet P, thereby forming the image. Then, the download portion of the sheet will be explained. In the sheet discharge portion 4, a transmitter cylinder 40 abuts the conveyor cylinder 36 and furthermore abuts a sheet discharge cylinder 41. Accordingly, a driving force of the conveyor cylinder 36 is transmitted to the sheet discharge cylinder 41 through the transmitter cylinder 40. In addition, the straight cylinders 42 abut against the sheet discharge cylinder 41 to be driven by the rotation of the sheet discharge cylinder.

The straight cylinders 42 are fixed to a straight stay 341 of the integral type that is provided on the stage 34. By providing the straight stay 341 integral with the stage 34 in this manner, since the dimensions of the straight cylinders 42 and the cylinder 41 of Leaf discharge can be controlled within the same part, a dimensional relationship can be stably maintained. In addition, the straight stay 341 has a partially recessed portion 346. When the head 7 is interchanged, the carriage 50 moves up to the recessed portion to create a space through which a hook lever 53 can be manipulated to be assembled. and disassembling the head 7. With the aforementioned arrangement, the sheet P, in which the image was formed in a portion 5 of the carriage, is tightened by a clamping point between the sheet discharge cylinder 41 and the straight cylinders 42 for transported and unloaded to the sheet discharge tray (not shown). Then the cleaning portion will be explained. The cleaning portion 6 includes a pump for cleaning the registration head 7, a cap for preventing drying of the registration head 7 and a driving switching arm for switching the driving force from the transporting cylinder 36 between the supply portion 2 of leaves and the pump. Then, the parts will be fully explained with respect to a sheet conveyor apparatus P having a bearing mechanism according to the present invention. Figures 3A to 3C and Figures 4A and 4B show a method for securing the conveyor cylinder 36 using the bearing mechanism in accordance with the present invention. Figure 3A is a left side view of the bearing, Figure 3B is a front view of the bearing, Figure 3C is a right side view of the bearing, Figure 4A is a view showing a condition where the bearing fits into a support plate and Figure 4B is a view showing a condition wherein the bearing is rotated and fixed after adjusting. First, one end of the metal arrow of the conveyor cylinder 36 is inserted into the bearing 39 and then fixed to the chassis (support plate) 8. Then, the other end of the metal arrow of the conveyor cylinder 36 is passed to Through a recessed portion (8a) of the chassis 8. Then, the tension spring 381 of the conveyor cylinder is fixed and an adjustment portion 387 (portion marked in Figure 3B) of the bearing 38 fits towards the chassis 8 while insert the bearing 38 into the arrow of the conveyor cylinder 36 from the outside (Figure 4A). In this case, between the tightening portions 382, 388 of the bearing 38, the tightening portion 382 for receiving the inner side of the chassis 8 passes through the recessed portion 8a of the chassis 8. In this condition, when the bearing 38 is rotated by holding a portion of the operation (handle portion) 383 of the bearing (Figure 4B), the chassis 8 is tightened between the two tightening portions 382, 388 of the bearing 38, in a position where the inner side and the outer side of the chassis 8 are opposite, thus preventing it from dislodging in the axial direction. In addition, the chassis receives the thrust force of the tension spring 381 of the conveyor cylinder. Also, a regulating portion (retainer) 384 as the fixing means is provided in the bearing 38, and a corresponding regulating portion 89 is provided in the chassis 8. With this arrangement, the regulating or protruding portion (retainer) 384 of the bearing 38 enters the regulating portion or hole (catch) 89 of the chassis 8, thus preventing the bearing 38 from being removed from the chassis 8.

The forces acting on the bearing 38 in this condition are shown in Figure 3B. The biasing force of the tension spring 381 of the conveyor cylinder acts on a portion of the tightening portion 382 of the bearing 38 that receives the inner side of the chassis 8. Since the portion of the first tightening portion 382 of the bearing 38 that receives the inner side of the chassis 8 is off-center, a force for the inclination of the bearing 38 around a point Pl acts along a direction shown by the arrow A. This force can be supported by a surface (stop portion) 388a of the second portion 388 of tightening the bearing 38 that receives the outer side of the chassis 8 in a direction shown by the arrow B. In this way, the conveyor cylinder 36 is positioned and stabilized. With the arrangement as mentioned above, since a portion of the groove is not required to retain the bearing, it is provided on the metal arrow of the conveyor cylinder 36, and that a corresponding catch is provided on the bearing, The number of manufacturing steps is reduced thus making possible a cheaper manufacturing cost. In addition, the operating capacity is improved since the sear is not damaged.

As shown in Figure 6A, the pressure cylinders 37 do not hold down the entire conveyor area of the sheet P, but only hold down four predetermined widths in the sheet. By making the pressure cylinders 37 smaller and shorter, the cost can be reduced. The guide 30 of the retaining cylinder for retaining the retention cylinders 37 and for pushing the retention cylinders against the conveyor cylinder 36 is formed of a one-piece member having some rigidity in areas where the pressure cylinders 37 exist and essentially no stiffness in the areas where the pressure cylinders 37 do not exist. With this arrangement, the force of the spring 31 of the pressure cylinder effectively acts on the pressure cylinders 37. Furthermore, in the areas where the pressure cylinders 37 do not exist, the guide ribs 302 are provided to prevent the P float sheet. Further, on an overlap scale between a downward holding portion 344 of the sheet provided in the platen 34 and adapted to prevent the side edge of the sheet P from floating and the conveyor area for the sheet P, it is provided a guide portion 303 for directing the side edge of the sheet P below the downward holding portion 344 of the sheet. The guide portion 303 has a section corresponding to a part of the configuration of the pressure cylinder 37. As shown in Figure 7, the guide portion has a smooth tapered surface extending from the outer periphery of the pressure cylinder 37 to one side upstream of the sheet P transporting direction. pressure cylinders 37 do not hold down the entire conveyor area of the sheet P, even when the side edge of the sheet P is warped, since the side edge is directed by the guide portion 303, the side edge of the sheet enters under the retention portion 344 downwardly of the sheet does not interfere with the carriage 50 or the registration head 7. With respect to the sheet discharge cylinder 41 and the straight cylinder 42 which are placed on the downstream side of the conveyor direction of the sheet P, the ribs 345 as protective members to prevent the sheet P from being held upwards that are provided in the fixing portion 341 of the straight cylinder of the straight stay of the stage 34, they are placed on both sides of all the straight cylinders 42.

Depending on the kind of registration medium (sheet P) or surrounding environment such as temperature and humidity, even when the trailing end of the sheet P is floating after it has been discharged, due to the presence of the protection members 345, the trailing end of the sheet. P sheet is not pressed between the straight rollers 42 and a straight cleaner 43 or the fixing portion 341 of the straight roller of the plate, with the result that the poor discharge of the sheets does not occur or the sheet P is not damaged by the straight cylinders 42. (Second mode) In the first embodiment mentioned above, even though an example was explained that the tightening portions of the bearing to tighten the chassis in the position where the inner side and the outer side of the chassis are opposite have the same width, as shown in Figures 9A to 9C, one of the tightening portions having a hole configuration 385 greater than a configuration of the corresponding other tightening portion. With this arrangement, any slide portion can be removed from a mold, so that the parts can be molded with a single construction, thereby stabilizing operation and reducing cost. The other constructions are the same as those in the first mode. (Third embodiment) In the first embodiment mentioned above, even though an example was explained that the guide portion 303 is provided with the guide 30 of the clamping cylinder to direct the sheet P towards the retention portion 344 downwardly of the sheet , the guide portion 303 can be provided in the downward holding portion 344 of the sheet itself. As shown in Figures 10 and 11, the downward holding portion 344 of the blade has an extension 344a extending upwardly upstream of the clamping cylinders 37 in the conveying direction of the sheet P so that the extension 344a overlaps with guide 30 of the clamping cylinder. With this arrangement, the sheet P is directed below the retention portion 344 downwardly of the sheets in a more positive manner. The other constructions are the same as those of the first modality. (Fourth embodiment) In the first embodiment, even though an example that, as the protection members 345 prevent the blade from being held up, the ribs provided in the straight cylinder fixing portion 341 of the straight stay of the plate 34 placed on both sides of all the straight cylinders 42 has been explained, these ribs can be placed only outside of the straight cylinders 42 further outwards. As shown in Figure 12, the ribs (guard members) 345 are provided only to the outside of the cylinders 42 straight further outwards. Also in this case, since both lateral edges of the rear end of the sheet P can be received, an effect to prevent the retention of the sheet can be achieved. With this arrangement, even when the protection members 345 are not placed on both sides of all the straight cylinders 42, the effect to prevent the retention of the sheet can be achieved, and the degree of design freedom is increased and the mold formation it can be facilitated The other constructions are the same as those of the first modality. Since the present invention has the above-mentioned construction and function, it is not required that a groove portion be formed in the arrow portion and any bead can be formed in the bearing, with the result that the number of manufacturing steps is reduced. , production efficiency can be improved and the cost can be reduced. Furthermore, since there is no damage to the bearing in the bearing, the operating capacity can also be improved. Further, when the driven cylinders do not hold down the entire conveyor area of the sheet to be transported, even when the side edge of the sheet to be transported is warped, the side edge is directed by the guide portion correctly. Also in a recording apparatus in which the sheet to be transported is a recording means, since the lateral edge of the recording medium can be directed under the retention portion downwardly of the sheet correctly by the guide member, the lateral edge of the recording medium does not interfere with the carriage or the registration head. In addition, depending on the kind of recording medium or surrounding environment, such as temperature and humidity, even when the trailing end of the recording medium is floating after being discharged, due to the presence of the protection members, the end Subsequent recording medium is not pressed between the straight cylinders and the fixing portion of the straight cylinder of the platen, with the result that good discharge of sheets does not occur or the recording medium is not damaged by the straight cylinders.

Claims (19)

R E I V I N D I C A C I O N S

1. A bearing mechanism comprising: a support plate having an opening portion for retaining a bearing; The bearing includes a fitting portion to be fitted within the opening portion of the support plate and having an arrow bore in which an arrow is to be inserted, and two tightening portions projecting outward and axially spaced apart. one of the other by a distance corresponding to a thickness of the support plate in the adjustment portion, wherein the support plate is provided around the opening portion thereof, with portions cut through which pass the tightening portions, and the tightening portions tighten the support plate from the inside and outside by moving the tightening portions from the trimmed portions by rotating the bearing after the bearing adjustment portion has been adjusted within the portion of opening of the support plate; and a fixing means for fixing the rotation of the bearing in a rotated position wherein the support plate is tightened by the tightening positions from the inside and outside.

A bearing mechanism according to claim 1, wherein the fastening means comprises a protrusion that is provided in a tightening portion of the bearing in the support plate, and a depression or hole portion that is provided in the another portion of tightening of the bearing and the support plate.

A bearing mechanism according to claim 1 or 2, wherein one of the two tightening portions projecting outward has a configuration greater than a configuration of the other tightening portion opposite, and an opening greater than the configuration of the other tightening portion is provided in the opposite position.

4. A bearing mechanism according to claim 1 or 2, wherein the bearing has a handle portion.

5. A conveyor apparatus having a conveyor cylinder and bearing mechanisms positioned on both sides of the conveyor cylinder, wherein: at least one of the bearing mechanisms comprises a bearing mechanism in accordance with claim 1.

6. A conveyor apparatus having a conveyor means comprising a conveyor cylinder and a driven cylinder opposite the conveyor cylinder with the interposition of a conveyor path and dividing into a plurality of cylinder portions along an axial direction, wherein: a guide member for holding down a side edge of a sheet to be transported is placed in a position where the driven cylinder is not placed and the side edge of the sheet to be transported is passed.

A conveyor apparatus according to claim 6, wherein the conveyor means has a retention portion of the driven cylinder for retaining the driven cylinder; and the guide member is provided in the retention portion of the driven cylinder.

A conveyor apparatus according to claim 6, wherein the guide member has a radius equal to that of the driven cylinder in a sectioned configuration in a portion of clamping points between the conveyor cylinder and the driven cylinder, and has a tapered configuration uniformly spaced from the conveyor path, from the portion of attachment points to one side upstream of the conveyor path.

9. A conveyor apparatus having a discharge cylinder of straight sheets and cylinders opposite the sheet discharge cylinder with the interposition of a conveyor path, wherein: a protection member to prevent a sheet from being held upwards is placed between the conveying path and the straight cylinders on one side downstream of the conveyor path.

10. A conveyor apparatus according to claim 9, wherein protection members are provided in a straight cylinder fixing portion and are placed at least exterior of the outer straight cylinders.

11. A recording apparatus having a recording head for forming an image on a recording medium as a sheet is transported, a carriage for holding the recording head, and capable of scanning in a main scanning direction, a guide means for guiding the carriage in the main carriage scan, and a conveyor means for transporting the registration means in the sub-scan direction, the recording apparatus comprising: a conveyor apparatus according to any one of claims 5 to 10.

12. A recording apparatus having a recording head for forming an image on a recording medium as a sheet is transported, a carriage for holding the recording head, and capable of scanning in a main scanning direction , a guide means for guiding the carriage in the main carriage scan, and a conveyor means for transporting the registration means in a sub-scan direction. n, wherein: the conveyor means comprises a conveyor cylinder, a driven cylinder opposite the conveyor cylinder and divided into a plurality of cylinder portions along an axial direction, a platen for defining a guide surface during registration, and a downward holding member provided in the platen to prevent a side edge of the recording means from float, and a guide member to hold down the side edge of the record means is placed in a position where the driven cylinder it is not placed and where the side edge of the recording medium is passed, and the guide member comprises a retention member-downward.

13. A cylinder support apparatus comprising: a cylinder having an arrow; bearings to rotatably hold the arrow on both ends of the cylinder; a support plate having an opening portion for retaining one of the bearings; and an elastic member positioned between at least one of the cylinder bearings to push the cylinder and the bearing to be separated away from each other; wherein one of the bearings has a pair of clamping portions extending in a radial direction of the arrow to be held to tighten the support plate from both sides in order to retain the bearing on the support plate, and a second portion The tightening of the tightening portions remote from the cylinder with respect to the support plate is provided with a stop portion abutting against the support plate in order to regulate the tilt of the bearing against an impetus generated by the first tightening portion of the bearing. the tightening portions near the cylinder with respect to the support plate and a pushing force of the elastic member.

14. A cylinder support apparatus according to claim 13, wherein the second tightening portion is longer than the first tightening portion.

15. A cylinder support apparatus according to claim 13, wherein the second tightening portion is provided with a regulating portion for regulating the rotation of the bearing around the arrow.

16. A cylinder support apparatus according to claim 13, further comprising a drive means for rotationally driving the cylinder.

17. A sheet transport apparatus comprising: a cylinder having an arrow; a measured impeller to rotationally drive the cylinder; a clamping cylinder cooperating with the cylinder to tighten and transport a sheet; bearings to rotatably hold the arrow at both ends of the cylinder; a support plate having an opening portion for retaining one of the bearings; and an elastic member positioned between at least one of the bearings and the cylinder and to push the cylinder and the pillow to be separated away from each other; wherein one of the bearings has a pair of tightening portions that extend in a radial direction of the arrow to be held to tighten the support plate from both sides to retain the bearing on the support plate, and a second tightening portion of the tightening portions distant from the cylinder with respect to the plate, the support is provided with a stop portion which abuts against the support plate in order to regulate the inclination of the bearing against an impetus generated by the first tightening portion of the bearings. tightening portions near the cylinder, with respect to the support plate and a pushing force of the elastic member.

18. An image forming apparatus comprising: a cylinder having an arrow; a driving means for rotating the cylinder; a tightening cylinder that cooperates with the cylinder to tighten and transport the sheet; an image forming means for forming an image on the sheet conveyed by the cylinder; bearings to rotatably hold the arrow at both ends of the cylinder; a support plate having an opening portion for retaining one of the bearings; and an elastic member positioned between at least one of the pillows and the cylinder for pushing the cylinder and the pillow to be separated away from each other; wherein one of the bearings has a pair of clamping portions extending in a radial direction of the arrow to be held to tighten the support plate from both sides in order to retain the bearing on the support plate, and a second tightening portion of the tightening portions remote from the cylinder with respect to the support plate is provided with a stop portion abutting against the support plate in order to regulate the tilt of the bearing against an impetus generated by the first portion of tightening the tightening portions near the cylinder with respect to the support plate and a pushing force of the elastic member.

19. An image forming apparatus according to claim 18, wherein the image forming means forms the image by discharging a droplet of ink towards a surface of the sheet.