JP2020083597A - Jam processing method for printer - Google Patents

Abstract

To allow easy and strain-free jam processing even when a jam occurs during printing on thick paper with a strong elasticity and also to enable easy implementation at low cost.SOLUTION: Provided is a jam processing method for a jam that occurs with thick paper Ps which is print paper P conveyed by a paper conveyance mechanism 1 provided with a conveyance roller unit 2 comprising pairs of upper and lower rollers 3..., 4... arranged at predetermined intervals along a paper conveyance path R, in which a curved portion Psr is formed at one side of the thick paper Ps in a left-right direction to remove the thick paper Ps by rotationally displacing one roller 3s or the other roller 4s after separatingly displacing, from the other roller 4s, only one side 3sp in an axial direction Fa of the one roller 3s in a conveyance roller unit 2s that is a target of the jam processing, in particular during jam processing.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jam processing method for a printer, which is suitable for use in processing a jam caused by a thick paper which is a print sheet.

Generally, printers using an electrophotographic method and an inkjet method have been widely spread, but with the progress of the times, the types of paper printed by this type of printer have been diversified. Particularly, in recent years, there is a tendency that print demand for thick paper used for large and small cards tends to increase, and a printer considering printing on thick paper has been proposed.

Conventionally, as this type of printer, the image forming apparatuses disclosed in Patent Documents 1 and 2 are known. The image forming apparatus of Patent Document 1 forms a curved conveyance path when a rigid recording paper such as a thick paper or a special paper such as an envelope is fed, because the curvature radius of the curvature portion of the curved conveyance path is small. To solve the problem that the conveyance resistance with respect to the inner contour guide member becomes large, it is not possible to proceed along the conveyance path that constitutes the curved portion, and jams and conveyance defects occur, and stable feeding operation is not possible. Specifically, the first transport guide plate is provided by replacing a part of the first transport guide plate, which is a fixed guide member forming the inner curved portion of the curved transport path. In addition, the movable guide plate is configured as a movable member that is displaceable in the direction in which the opening distance from the second transport guide plate is widened by the force received from the fed paper.

Further, the image forming apparatus of Patent Document 2 aims to reduce jams by changing the shape of the transport path in response to the transport of thick paper or strong paper. When a thick sheet of paper is conveyed upward, when its tip hits the surface of the second chute, it pushes it up, and when the second chute rotates clockwise about its fulcrum, the spacer As a result, the third chute also rotates in the same manner, and this rotation of the chute stops when it balances with the strength of the waist of the paper itself. Of the second chute and the lower surface of the third chute have a gradual curvature, and facilitate the passage of a C-shaped curved conveyance path. It was done.

JP, 2007-131455, A JP-A-9-34191

However, the conventional printer (image forming apparatus) described above, and particularly the jam processing method of the printer, has the following problems.

That is, as the demand for thick paper as a printing paper increases, the specifications of the thick paper itself also increase, and the thickness tends to increase. Conventionally, the thick paper of 350 [gsm] (thickness: 0.3 [mm]) is the mainstream. However, at present, thick paper of 400 to 450 [gsm] (thickness: 0.5 [mm]) is generally used.

Therefore, the stiffness of the thick paper also tends to be stronger, and the problem of how to deal with the jam caused by the thick paper during transportation becomes a problem. That is, when the stiffness of the thick paper becomes strong, performing the jam processing similar to that of the plain paper causes various problems because the stiffness is strong. Specifically, there is a risk that the jam handling may be difficult due to the structural limitation of the paper transport mechanism, and when performing the forcible jam handling, the peripheral mechanism including the transport roller may be adversely affected and the jam handling may be adversely affected. Unnecessary processing time is spent in processing.

On the other hand, in the prior art, despite the above-mentioned potential problems in thick paper, a technique for improving the transportability for thick paper, such as increasing the radius of curvature of the transport path, is mainly As a matter of fact, almost no proposal has been made regarding a technique relating to a jam processing method for thick paper having a stronger waist.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a printer jam handling method that solves the problems existing in the background art.

In order to solve the above-described problems, the present invention is carried by a paper carrying mechanism 1 including a carrying roller unit 2 having a pair of upper and lower rollers 3, 4, which are arranged at predetermined intervals along a paper carrying path R. A jam clearance method for a printer M that clears a jam generated by a thick paper Ps serving as a print paper P, which is one of the axial directions Fa of one roller 3s in a conveyance roller unit 2s to be jammed during jam clearance. After displacing only the side 3sp away from the other roller 4s, one roller 3s or the other roller 4s is rotationally displaced, and a curved portion for removing the cardboard Ps on one side in the left-right direction of the cardboard Ps. It is characterized in that Psr is formed.

In this case, according to a preferred aspect of the invention, the displacement amount Lh by which the one side 3sp of the one roller 3s in the axial direction Fa is displaced away from the other roller 4s is released from the pressure contact of the one side 3sp of the one roller 3s. Further, the rotational displacement of the one side 3sp of the one roller 3s and the one side 4sp of the other roller 4s facing the one side 3sp can be set to an amount that is not transmitted to the thick paper Ps. In addition, a roller operating unit 6 for rotationally displacing the one roller 3s or the other roller 4s by a manual operation is provided. The roller operating unit 6 receives the rotational displacement of the one roller 3s or the other roller 4s. The one-way clutch 16 to be connected and the operation knob 17 provided integrally with the one-way clutch 16 can be provided and configured. Further, one roller 3s can be applied to the pinch roller arranged on the upper side, and the other roller 4s can be applied the drive roller arranged on the lower side. On the other hand, as the direction in which the one roller 3s is displaced away from the other roller 4s, the direction Fs perpendicular to the paper surface Psf of the thick paper Ps may be selected, or the parallel direction Fp to the paper surface Psf may be selected. You may.

According to the jam processing method of the printer according to the present invention by such a method, the following remarkable effects are obtained.

(1) At the time of jam processing, only one side 3sp of the axial direction Fa of one roller 3s in the conveyance roller portion 2s to be jammed is displaced away from the other roller 4s, and then one roller 3s or the other roller 3s is moved. When the roller 4s is rotationally displaced to form a curved portion Psr for removing the thick paper Ps on one side in the left-right direction of the thick paper Ps, when a jam occurs when printing the thick thick paper Ps. Even in this case, it is possible to easily perform the jam processing without causing any trouble. As a result, it is possible to eliminate the adverse effect that the jam processing has on the peripheral mechanism including the transport roller portion 2s, and to perform the jam processing quickly and efficiently. In addition, it is possible to contribute to downsizing, cost reduction, and ease of implementation when constructing the sheet transport mechanism 1 that can implement the jam processing method.

(2) According to a preferred aspect, the displacement amount Lh by which the one side 3sp of the one roller 3s in the axial direction Fa is displaced away from the other roller 4s is such that the pressure contact of the one side 3sp of the one roller 3s is released, and If the rotational displacement of the one side 3sp of the one roller 3s and the one side 4sp of the other roller 4s facing the one side 3sp is set to an amount that is not transmitted to the thick paper Ps, the smallest displacement amount (a displacement with a small inclination). Since it is possible to set (amount), it is possible to more reliably move the thick paper Ps during jam processing, and it is possible to contribute to simplification (miniaturization) in mechanism design.

(3) According to a preferred mode, a roller operating unit 6 for rotatably displacing the one roller 3s or the other roller 4s by a manual operation is provided, and the roller operating unit 6 rotates the one roller 3s or the other roller 4s. If the one-way clutch 16 to which the dynamic displacement is input and connected and the operation knob 17 provided integrally with the one-way clutch 16 are provided, the roller operation unit 6 allows the one roller 3s or the one roller 3s to move in only one direction. Since the other roller 4s can be rotated, the user can easily feed the thick paper Ps and form the curved portion Psr by manual operation, and avoid unnecessary rotation of the operation knob 17 during normal operation. ..

(4) According to a preferred mode, when one roller 3s is applied to the pinch roller arranged on the upper side and the other roller 4s is applied to the drive roller arranged on the lower side, one of the pinch rollers which becomes an idle roller is formed. One side roller 3s and the other side roller 4s are selected so that the side 3sp can be displaced up and down and the rotating drive roller can be maintained as it is, so that the structure can be simplified and the operation can be ensured and stabilized. From the viewpoint, it can be implemented as an optimum form.

(5) According to a preferred mode, if the direction in which the one roller 3s is displaced away from the other roller 4s is selected to be the direction Fs perpendicular to the paper surface Psf of the thick paper Ps, one side 3sp of the one roller 3s is selected. Since it can be realized by a mechanism that displaces only the up and down, it can contribute to simplification of the configuration, facilitation of implementation, and further reduction in size and cost.

(6) According to a preferred aspect, if the direction in which the one roller 3s is displaced away from the other roller 4s is selected to be the parallel direction Fp to the paper surface Psf of the thick paper Ps, the thick paper Ps of the one roller 3s Since the feed angle can be changed, that is, the feed angle for feeding the thick paper Ps can be set, it is possible to contribute to the formation of the curved portion Psr more easily and reliably.

A flowchart for sequentially explaining a jam processing method according to a preferred embodiment of the present invention, A front view including a partial cross section of a state in which one roller of a transport roller unit included in a paper transport mechanism capable of implementing the jam handling method is displaced to a separated position, A side view of a state in which one roller of a transport roller unit included in the paper transport mechanism is displaced to a separated position, A plan view of the paper transport mechanism during jam processing, A side cross-sectional view of the same paper transport mechanism during jam processing, A plan view of the paper transport mechanism during normal operation, A schematic diagram showing an example of a printer including the same paper transport mechanism, A front view including a partial cross-section during normal operation of the paper transport mechanism, A side view including a partial cross-section during normal operation of the paper transport mechanism, A front view including a partial cross-section during jam processing of the paper transport mechanism, A side view including a partial cross section at the time of jam processing of the paper transport mechanism, A front view including a partial cross section of a state in which one roller of a transport roller unit of a sheet transport mechanism according to a first modified embodiment capable of implementing the jam processing method is displaced to a separated position,

A side view of a state in which one roller of a transport roller unit included in the paper transport mechanism according to the first modified embodiment is displaced to a separated position,

A plan view including a partial cross section showing one roller of a transport roller unit of a paper transport mechanism according to a second modified embodiment capable of implementing the same jam processing method,

A front view including a partial cross section of a transport roller portion of a paper transport mechanism according to the second modified embodiment,

Next, preferred embodiments according to the present invention will be described in detail with reference to the drawings.

First, in order to facilitate understanding of the jam processing method according to the present embodiment, an outline of the printer M that can perform the jam processing method will be described with reference to FIG. 7.

FIG. 7 shows an example of a printer M capable of implementing the same processing method. Various printing methods such as an electrophotographic method and an inkjet method can be applied to the printing method of the printer M, and the printing method is not limited to a specific printing method.

The illustrated printer M includes a cabinet (outer casing) 51 indicated by phantom lines, a paper feed tray 52 on one side (right side in the drawing) of the cabinet 51, and a discharge tray on the other side (left side in the drawing). A paper tray 53 is provided. In this case, the thick paper Ps can be set as the paper P in the paper feed tray 52. As the thick paper Ps, a thick paper Ps having a thickness of 350 [gsm] or more or a thickness of 0.3 [mm] or more can be applied. Therefore, the thick paper Ps which is generally 400 to 450 [gsm] or the thickness: 0.5 [mm], which is generally used recently, can be sufficiently used. Therefore, the illustrated printer M is configured as a printer that can also deal with jam processing when the thick paper Ps having particularly strong rigidity is used.

Although various thick papers Ps can be applied to the paper P, the application of other papers such as plain paper is not excluded. On the other hand, when focusing on the thick paper Ps, generally, a postcard (190 [gsm], thickness 0.23 [mm]) or more is defined as the thick paper. Since it has been confirmed that the problem (problem) of this time is likely to occur when it exceeds 300 [gsm], as the thick paper Ps, particularly about 300 [gsm] or a thickness of 0.23 [mm] It is suitable to apply the jam processing method according to the present invention when it exceeds the limit.

A paper conveyance path R (see FIG. 6) is arranged inside the printer M, and the thick paper Ps (print paper P) carried in from the paper feed tray 52 is conveyed by the paper conveyance path R and the paper ejection tray 53. Is carried over. Further, on the upstream side of the paper transport path R, a print unit 54 that performs print processing on the transported thick paper Ps is disposed. Then, the paper transport mechanism 1 to be processed by the jam processing method according to the present embodiment is disposed between the print unit 54 and the paper discharge tray 53. In addition, a printer controller 55, a cassette paper feeder 56, and the like are provided as main components inside the printer M, and an operation panel 57 including a display and a jam controller are provided in the cabinet 51 that forms the outer shell of the printer M. An openable outer cover portion 58 and the like that expose the sheet conveying mechanism 1 by opening at times are provided. In this case, the printer controller 55 controls various control functions such as sequence control processing in the printer M, and the cassette paper feeder 56 sets plain paper and various sizes and types of paper P. Automatic paper feeding is performed.

As a result, the thick papers Ps... Set on the paper feed tray 52 are carried into the cabinet 51 one by one by the paper feed mechanism (not shown), and are transported through the paper transport path R. At this time, the print processing is performed by the print unit 54, and the printed thick paper Ps is discharged onto the paper discharge tray 53 through the paper transport mechanism 1.

Next, the configuration of the paper transport mechanism 1 that is the processing target of the jam processing method according to the present embodiment will be specifically described with reference to FIGS. 2 to 7.

As shown in FIGS. 4 to 6, the paper transport mechanism 1 includes a transport roller unit 2 having a pair of upper and lower rollers 3,..., 4 arranged along the paper transport path R at predetermined intervals, and the thick paper Ps. (Paper P) can be conveyed. In the drawing, three conveying roller units 2... Are arranged at predetermined intervals, but the number and intervals of the conveying roller units 2 are arbitrarily set according to the specifications of the printer M. In addition, the paper transport mechanism 1 includes a jam processing mechanism section 7 that is a target of a specific process when the jam processing method according to the present embodiment is performed. The central conveyance roller unit 2 shown in FIGS. 4 to 6 is the conveyance roller unit 2s that constitutes the jam processing mechanism unit 7 that is the target of the jam processing. In FIG. 5, reference numerals 59,... Show the upper and lower guide plates that form the paper transport path R, and reference numeral 60 denotes an openable inner cover portion that can be opened during jam processing.

As shown in FIG. 2, the transport roller portion 2s includes a pair of upper and lower rollers 3s and 4s, that is, one roller (hereinafter, referred to as an upper roller) 3s arranged on the upper side and the other roller (hereinafter, referred to as an upper roller) 3s arranged on the lower side. , Lower roller) 4s, the lower roller 4s functions as a drive roller, and the upper roller 3s functions as a pinch roller. In this case, the upper roller 3s includes a cylindrical roller body 21 formed of an elastic material such as rubber having a large friction coefficient, and a roller shaft 22 fixed to the center of the roller body 21, and the lower roller 4s also moves upward. A cylindrical roller body 23 having the same structure as the roller 3s and a roller shaft 24 fixed to the center of the roller body 23 are provided. In this way, if one roller 3s is applied to the pinch roller arranged on the upper side and the other roller 4s is applied to the drive roller arranged on the lower side, when the jam processing mechanism unit 7 is configured, the idle roller Since one side 3sp of the pinch roller to be moved up and down can be displaced up and down and the drive roller that is rotating can be maintained as it is, the simplification of the structure, the secure operation and the stabilization can be ensured. From the viewpoint of selecting the roller 4s, it can be implemented as an optimum form.

The roller shaft 24 of the lower roller 4s is rotatably supported by a pair of left and right bearing portions 26, 27 provided on the chassis 25 at both ends. On the other hand, the upper roller 3s is supported so that it can be displaced upward, and is supported by the support mechanism portion 18 that is urged downward by the elastic means 19. As shown in FIG. 2, the illustrated supporting mechanism portion 18 rotatably fits a pair of left and right bearing portions 28 and 29 near both ends of the roller shaft 22 of the upper roller 3s. , The chassis 25 is supported by elongated hole guides provided so as to be vertically displaceable, and collars (bearing portions) 30 and 31 are fitted on the roller shafts 22 outside the bearing portions 28 and 29. 30 and 31 are urged downward by the pressurizing portions 32 and 33 using the compression springs that constitute the elastic means 19.

Then, the jam processing mechanism unit 7 is configured by using the transport roller unit 2s. As shown in FIG. 2, the jam clearance mechanism section 7 includes a roller displacement mechanism section 5 arranged on one side of the conveying roller section 2s and a roller operating section 6 arranged on the other side of the conveying roller section 2s. The roller displacement mechanism portion 5 includes a torque limiter 11, a release cam portion 12, a first one-way clutch 13, and a stopper portion 15 shown in FIG. 3, which are arranged on one side 4sp of the lower roller 4s, and the other side of the lower roller 4s. It is provided with a second one-way clutch 16 and an operation knob 17 arranged on 4sq, and an engaging slave portion 14 arranged on one side 3sp of the upper roller 3s.

In this case, the first one-way clutch 13 is attached near one end 24p of the roller shaft 24 of the lower roller 4s, and the torque limiter 11 and the release cam portion 12 are sequentially arranged on the roller shaft 24 inside the first one-way clutch 13. Install. At this time, the rotational displacement of the lower roller 4s is input to the first one-way clutch 13, and the output of the first one-way clutch 13 is input (connected) to the torque limiter 11. Further, the release cam portion 12 is provided integrally with the torque limiter 11, and the stopper portion 15 is provided at a position Xr in which the cam surface 12f of the release cam portion 12 faces upward as shown in FIG. An arrangement position that abuts on 12 and can hold (restrict) that position is selected.

As described above, when the roller operation mechanism unit 5 is configured, the torque limiter 11 to which the rotational displacement of the lower roller 4s is input, the release cam unit 12 provided integrally with the torque limiter 11, and the torque limiter 11 are provided. The first one-way clutch 13 to which the rotational displacement is input and connected, the engagement slave portion 14 provided on the upper roller 3s and engageable with the release cam portion 12, and the release cam portion 12 at the position Xr displaced apart. If the stopper portion 15 for holding is provided, the torque limiter 11, the release cam portion 12 and the first one-way clutch 13, which are the constituent parts, can be arranged coaxially with the lower roller 4s and can be engaged with each other. Since the portion 14 can be arranged coaxially with the upper roller 3s, it can be implemented as a preferable form from the viewpoint of realizing a compact and simple structure.

Further, the engagement sub-portion 14 is constituted by the engagement gear 14g, and the cam surface 12f of the release cam portion 12 is formed with a gear portion 12g capable of meshing with the engagement gear 14g. With such a configuration (formation), the separation displacement of the upper roller 3s and the release of the separation displacement can be performed by the meshing of the gear portion 12g and the engagement gear 14g, so that a more reliable and stable separation displacement and The separation displacement can be released, and further the jam processing can be performed.

Further, the displacement amount Lh by which the one side 3sp in the left-right direction of the upper roller 3s is displaced away from the lower roller 4s, the pressure contact of the one side 3sp of the upper roller 3s is released, and the one side 3sp of the upper roller 3s and this The rotation displacement of the one side 4sp of the lower roller 4s facing the one side 3sp is set to an amount (interval) not transmitted to the thick paper Ps. Therefore, this displacement amount Lh can be set to a slight displacement amount within 1 [mm]. By setting the displacement amount Lh in this way, the smallest displacement amount (displacement amount with a small inclination) can be set, so that the thick paper Ps can be moved more reliably during the jam processing, and the mechanism design can be performed. It can also contribute to simplification (miniaturization).

On the other hand, the roller operation unit 6 is configured by providing a second one-way clutch 16 to which the rotational displacement of the lower roller 4s is input and connected, and an operation knob 17 integrally provided with the second one-way clutch 16. .. If the roller operation unit 6 configured as described above is provided, the above-described roller operation mechanism unit 5 is arranged on one side 4sp of the lower roller 4s, and the roller operation unit 6 is arranged on the other side 4sq of the lower roller 4s. Therefore, it can be implemented as an optimum form from the viewpoint of miniaturization and simplification in the case of combining them. Moreover, since the roller operation unit 6 can rotate the one roller 3s or the other roller 4s only in one direction, the user can easily manually feed the thick paper Ps to form the curved portion Psr. In addition, it is possible to avoid unnecessary rotation of the operation knob 17 during normal operation.

As described above, the roller displacement mechanism unit 5 is capable of displacing only one side 3sp of the upper roller 3s in the left-right direction in the conveyance roller unit 2s that is the target of the jam processing by the rotational displacement of the lower roller 4s. And a roller operation unit 6 capable of rotating the lower roller 4s. A driven gear 35 is fixed to the roller shaft 24 of the lower roller 4s, a drive motor 36 is arranged near the driven gear 35, and a drive gear 37 fixed to the motor shaft of the drive motor 36 and a driven gear 37 are driven. By connecting the gears 35 via a rotation transmission mechanism 38 using a belt element or a gear element, a rotation drive system for the lower roller (drive roller) 4s is configured.

Next, the jam processing method according to the present embodiment including the operation of the sheet transport mechanism 1 including the jam processing mechanism unit 7 will be described with reference to the drawings and the flowchart shown in FIG.

Now, it is assumed that the printer M provided with the paper transport mechanism 1 is operating normally (step S1). In this case, the paper transport mechanism 1 is in the state shown in FIGS. 8 and 9, and the thick paper Ps is normally transported in the transport direction Ff. At this time, the rotation of the drive motor 36 shown in FIGS. 2 and 3 is transmitted in order of the drive gear 37, the rotation transmission mechanism 38, and the driven gear 35, and the drive roller serving as the lower roller 4s is the clockwise Ft in FIG. Rotate to. At this time, since the first one-way clutch 13 and the second one-way clutch 16 attached to the lower roller 4s are free in the transport direction Ff, that is, in the disconnected state, the rotation of the lower roller 4s is controlled by the operation knob 17. And is not transmitted to the release cam portion 12 (torque limiter 11). As a result, in particular, the release cam portion 12 is in a state in which the cam surface 12f faces downward as shown in FIG. 9 due to its own weight effect, and the engagement with the engagement gear 14g is released. Further, as shown in FIG. 8, the pinch roller serving as the upper roller 3s is parallel to the drive roller (lower roller 4s) and comes into pressure contact with the thick paper Ps. Therefore, if the normal operation is continued, the operation is ended by the end of the printing process (step S3).

On the other hand, assume that a jam occurs during normal operation (step S2). FIG. 11 exemplifies the state of the thick paper Ps when a jam occurs. The paper transport mechanism 1 is stopped (automatically stopped) due to the occurrence of a jam. That is, the conveyance of the thick paper Ps is stopped (step S4). 2 to 5 each show a mode when a jam occurs. In the case of the example, when a jam occurs, the outer cover portion 58 shown in FIG. 7 is opened, and further, the inner cover portion 60 shown in FIG. 5 is opened to provide a jam treatment area He capable of performing the jam treatment. be able to. In FIG. 5, the solid line inner cover portion 60 is shown in an open state, and the virtual line inner cover portion 60 is shown in a closed state.

Next, the user of the printer M rotationally operates the operation knob 17 in the direction Fr (counterclockwise direction Fn in FIG. 11) opposite to the carrying direction Ff (step S5). As a result, the second one-way clutch 16 and the first one-way clutch 13 are connected in the reverse direction Fr, so that the rotational displacement of the operation knob 17 causes the second one-way clutch 16, the roller shaft 24 of the lower roller 4s, It is transmitted to the release cam portion 12 via the first one-way clutch 13 and the torque limiter 11. As a result, the release cam portion 12 is rotationally displaced, that is, is rotationally displaced in the counterclockwise direction Fn in FIG. 9 (step S6). It should be noted that in FIG. 3, the release cam portion 12 shown by an imaginary line shows a state in the middle of rotation in the counterclockwise direction Fn.

The rotational displacement of the release cam portion 12 brings the release cam portion 12 into contact with the engagement gear 14g, and further rotational displacement causes the gear portion 12g to mesh with the engagement gear 14g. As a result, the engagement gear 14g is pushed up by the release cam portion 12, and the one side 3sp of the upper roller 3s is displaced upward as shown in FIG. 11 (step S7). This state is shown in FIGS. 10 and 11. In this case, only one side 3sp of the upper roller 3s is displaced upwards, a gap Lhs is formed between the one side 3sp of the upper roller 3s and the upper surface of the thick paper Ps, and the other side 3sq of the upper roller 3s is made of the thick paper Ps. Is pressed against the upper surface of. Further, as the release cam portion 12 is rotationally displaced, the release cam portion 12 contacts the stopper portion 15 and is held at this position Xr as shown in FIG. 3 (step S8).

Further, since the release cam portion 12 is attached to the lower roller 4s via the torque limiter 11 and the first one-way clutch 13, the turning operation of the operation knob 17 resists the torque set in the torque limiter 11. Can be further continued (step S9). As a result, it is possible to rotate the lower roller 4s in the reverse direction Fr while holding the one side 3sp of the upper roller 3s at the position Xr displaced from the lower roller 4s. Only the other side portion of the thick paper Ps, which is pressed by the 3sq and the other side 4sq of the lower roller 4s, is fed in the reverse direction Fr (step S10).

As a result, a curved portion Psr as shown in FIGS. 4 and 5 is generated on the other side portion (the other side portion) of the thick paper Ps (step S11). Therefore, the user of the printer M can easily pull out from the transport roller portion 2s by putting his/her finger in the space formed below the curved portion Psr, grasping the thick paper Ps, and pulling it backward (in the reverse direction Fr). In addition to being possible, it can be taken out from the jam processing area He (step S12).

As a result, a series of jam processing is completed. Therefore, when the operation of the printer M is restarted, the carrying roller unit 2s carries out a normal carrying operation in the carrying direction Ff (steps S13 and S14). Then, along with this, the engagement gear 14g rotates in the transport direction Ff, so that the gear portion 12g meshing with the engagement gear 14g, that is, the lease cam portion 12, is rotationally displaced in the transport direction Ff (step S15). As a result, the separation displacement of the upper roller 3s from the lower roller 4s is released, so that the one side 3sp of the upper roller 3s is displaced downward and returned to the normal position (step S16). In this case, as shown in FIG. 8, the pinch roller serving as the upper roller 3s is positioned parallel to the drive roller (lower roller 4s). The first one-way clutch 13 having the release cam portion 12 attached thereto is free from the lower roller 4s (roller shaft 24) in the transport direction Ff, that is, in the disconnected state, so that the lower roller 4s does not rotate. It is not transmitted to the operation knob 17 and the release cam portion 12 (torque limiter 11). As a result, the release cam portion 12 is in a state in which the cam surface 12f faces downward due to its own weight effect, as shown in FIG.

As described above, the jam treatment method for the printer M according to the present embodiment is, as a basic technique, only the one side 3sp of the axial direction Fa of the one roller 3s in the conveyance roller portion 2s to be subjected to the jam treatment during the jam treatment. Is displaced from the other roller 4s, and then one roller 3s or the other roller 4s is rotationally displaced to form a curved portion Psr for removing the thick paper Ps on one side in the left-right direction of the thick paper Ps. Therefore, even if a jam occurs during printing of the thick paper Ps having a particularly strong stiffness, the jam process can be easily performed without causing any stress. As a result, it is possible to eliminate the adverse effect that the jam processing has on the peripheral mechanism including the transport roller portion 2s, and to perform the jam processing quickly and efficiently. In addition, it is possible to contribute to downsizing, cost reduction, and ease of implementation when constructing the sheet transport mechanism 1 that can implement the jam processing method.

Next, another modified embodiment of the sheet transport mechanism 1 to which the jam processing method according to the present invention can be applied will be described with reference to FIGS.

First, the first modified embodiment will be described with reference to FIGS. 12 and 13. In the embodiments shown in FIGS. 1 to 11 described above, an example in which at least a part of the jam processing operation is performed (combined) with the operation (function) of the paper transport mechanism 1 is shown. The first modified embodiment shown in FIG. 13 shows an example in which most of the jam handling operations are performed manually by the user.

In the first modified embodiment, the jam processing is performed manually by the user, so that the roller operation mechanism section 5 in the jam processing mechanism section 7 is not used. That is, the torque limiter 11, the release cam portion 12, the first one-way clutch 13, the engagement follower portion 14, and the stopper portion 15 which form the roller operation mechanism portion 5 are unnecessary. Instead of these, the manual operation mechanism section 5x shown in FIGS. 12 and 13 is provided. The roller operating unit 6 can use the above-described roller operating unit 6 as it is.

Therefore, the manual operation mechanism section 5x is provided with the lever operation section 42 in which the collar 41 is rotatably mounted on the roller shaft 22 and abuts on the collar 41 to move up and down. In this case, as shown in FIG. 13, the lever operation part 42 includes an L-shaped lever part 42a, a rotation support part 42b for rotatably supporting an intermediate position of the lever part 42a, and the lever part 42a. A position regulation unit 42c that regulates the operation range is provided. In addition, it is desirable that the position restricting portion 42c be provided with a pause function portion that can be stopped by clicking at both ends of the operation range.

As a result, as shown in FIG. 13, if the vertical handle portion 42ah of the lever portion 42a is operated in the clockwise direction Ft and displaced to the position Xt indicated by the phantom line, the horizontal engaging portion of the lever portion 42a. 42as can be spaced downward from the collar 41, and the upper roller 3s can be brought into a use position where it is pressed against the lower roller 4s in parallel, and when a jam occurs, the handle portion 42ah is moved counterclockwise. When operated to Fn and displaced to the position Xn indicated by the solid line, the engaging portion 42as comes into contact with the lower surface of the collar 41 and further pushes it up, so that one side 3sp of the upper roller 3s is moved relative to the lower roller 4s. Thus, they can be separated by the displacement amount Lh shown in FIG.

As a result, the upper roller 3s can be displaced to a position where jam processing can be performed, as in the above-described embodiment shown in FIGS. 1 to 11, and henceforth, the operation knob 17 of the roller operation unit 6 will be used thereafter. The same jam processing can be performed by rotating the. On the other hand, when the jam processing is completed, the handle portion 42ah is operated in the clockwise direction Ft to be displaced to the position Xt indicated by the imaginary line. 3s can be returned to the use position where it is pressed against the lower roller 4s in parallel.

Next, a second modified embodiment will be described with reference to FIGS. 14 and 15. In the above-described embodiments shown in FIGS. 1 to 13 (including modified embodiments), an example in which the upper roller 3s is displaced in the direction Fs (FIG. 13) perpendicular to the paper surface Psf of the thick paper Ps (the vertical direction). 14 and 15 show an example in which the upper roller 3s is displaced in the parallel direction (horizontal direction) Fp (FIG. 14) with respect to the paper surface Psf of the thick paper Ps.

In the second modified embodiment, the support structure of the upper roller 3s is partially changed in order to displace the upper roller 3s in the parallel direction Fp with respect to the paper surface Psf of the thick paper Ps. That is, in the illustrated example, as shown in FIGS. 14 and 15, the other end of the roller shaft 22 of the upper roller 3s is rotatably supported by the L-shaped movable plate 45, and is horizontally supported by the chassis 25. The portion 25h is formed, and the movable plate 45 is rotatably supported on the horizontal support plate portion 25h by the vertical rotation support portion 46. In particular, the position of the rotation support portion 46 is selected near the end of the other side 4sp of the lower roller 4s (the other side 3sp of the upper roller 3s), and the upper roller 3s is rotationally displaced with the rotation support portion 46 as a fulcrum. At this time, it is considered that the pressure contact with the lower roller 4s does not move.

12 is the same as the first modified embodiment of FIGS. 12 and 13, except that the roller operation mechanism portion 5 that displaces the one side 3sp of the upper roller 3s is not provided. Further, unlike FIG. 13, the manual operation mechanism portion 5y for horizontally displacing the one side 3sp of the upper roller 3s is provided. In this case, the chassis 25 is provided with a horizontal elongated hole guide portion 25c, the bearing portion 28 is supported by the elongated hole guide portion 25c, and one side 3sp of the upper roller 3s is moved in the parallel direction (horizontal direction) Fp described above. A horizontal displacement operation unit 47 for displacing is provided. Note that, even in the second modified embodiment, as in the first modified embodiment, it is also possible to carry out the configuration in which the lever operation portion 42 is directly operated, but the horizontal operation illustrated in FIGS. 14 and 15 is also possible. The displacement operation unit 47 is configured so that it can be remotely operated from a separated position.

That is, in the illustrated horizontal displacement operation unit 47, the operation handle 47a is arranged near the operation knob 17, one end of the operation wire 47b is coupled to the operation handle 47a, and the other end of the operation wire 47b is connected to the operation handle 47a. The roller shaft 22 is connected to the collar 41 mounted on one side of the roller shaft 22. In addition, as shown in FIG. 14, the horizontal displacement operating portion 47 includes a vertical support plate portion 25v formed on the chassis 25, a tension spring 47c having one end coupled to the collar 41 and the other end coupled to the vertical support plate portion 25v. A guide roller portion 47d for guiding the intermediate portion of the operation wire 47b, and a position regulation portion 47e for regulating the operation range of the operation handle 47a. It should be noted that it is desirable that the position regulating portion 47e be provided with a temporary stop function portion that can be clicked to stop at both ends of the operation range.

As a result, as shown in FIG. 14, when the operation handle 47a is operated and displaced to the position indicated by the solid line, the operation wire 47b is displaced in the direction of the arrow Fu and the upper roller 3s is moved to the position indicated by the solid line, that is, , The lower roller 4s can be set to a use position that is parallel to the lower roller 4s in a plan view. At this time, the one side 3sp of the upper roller 3s is pulled in the reverse direction Fr with respect to the transport direction Ff by the tension spring 47c, and the collar 41 comes into contact with one end of the elongated hole guide portion 25c to regulate the position. On the other hand, when the operation handle 47a is operated and displaced to the position indicated by the phantom line, the operation wire 47b and further the collar 41 are pulled and displaced in the direction of the arrow Fw. It is possible to displace 3sp to a position indicated by a virtual line. That is, the upper roller 3s is displaced to a position inclined with respect to the lower roller 4s, and the one side 3sp of the upper roller 3s is parallel to the lower roller 4s by the displacement amount Lh shown in FIG. 14 (horizontal direction). Separate to Fp.

In the second modified embodiment, unlike the displacement amount Lh in the right angle direction Fs in the first modified embodiment, the displacement amount Lh is generated in the parallel direction Fp. However, even when the displacement amount Lh is set, the lower roller 4s is also set. The pressure contact of one side 3sp of the upper roller 3s with respect to is released, and the rotational displacement of the one side 3sp of the upper roller 3s and the one side 4sp of the lower roller 4s facing the one side 3sp is not transmitted to the thick paper Ps. Set.

As described above, in the jam handling method according to the present embodiment, the direction in which the one side 3sp of the upper roller 3s is displaced away from the paper surface Psf (lower roller 4s) of the thick paper Ps is a right angle as shown in FIGS. It may be displaced in the direction (vertical direction) Fs, or may be displaced in the parallel direction (horizontal direction) Fp as shown in FIGS. 14 and 15. If the direction for separating and displacing is selected to be the direction Fs perpendicular to the paper surface Psf of the thick paper Ps, it can be realized by a mechanism that displaces only one side 3sp of the one roller 3s up and down, so that the configuration is simplified and implementation is facilitated. Further, it can contribute to downsizing and cost reduction. On the other hand, if it is selected in the parallel direction Fp with respect to the paper surface Psf of the thick paper Ps, the feed angle of the thick paper Ps on one roller 3s can be changed, that is, the feed angle for feeding the thick paper Ps can be set, so that it is easier. In addition, it can contribute to the reliable formation of the curved portion Psr.

Although the preferred embodiment has been described in detail above, the present invention is not limited to such an embodiment, and the gist of the present invention is not limited to such a configuration, shape, method, material, quantity, numerical value, and the like. It can be arbitrarily changed, added, or deleted without departing from the scope.

For example, when setting the displacement amount Lh by which the one side 3sp of the one roller 3s in the axial direction Fa is displaced away from the other roller 4s, the pressure contact of the one side 3sp of the one roller 3s is released, and the one side 3sp of the one roller 3s is released. It is desirable to set the minimum amount on condition that the rotational displacement of the one side 3sp of the roller 3s and the one side 4sp of the other roller 4s facing the one side 3sp is not transmitted to the thick paper Ps, but an arbitrary amount. Can be set to, and is not necessarily limited to this condition. On the other hand, as the roller operating unit 6, an example in which the other roller 4s is rotationally displaced by manual operation is shown, but one roller 3s may be rotationally displaced by manual operation. At this time, the roller operating unit 6 is provided with a one-way clutch 16 to which the rotational displacement of the one roller 3s or the other roller 4s is input and connected, and an operation knob 17 provided integrally with the one-way clutch 16. However, the second one-way clutch 16 does not necessarily have to be provided, as well as being replaced by another configuration having the same function. It is desirable to apply the pinch roller disposed on the upper side to the one roller 3s and the drive roller disposed on the lower side to the other roller 4s, but the case where these rollers are replaced is excluded. Not a thing.

The paper transport mechanism according to the present invention can be used for various printers using an electrophotographic method, an inkjet method, or the like.

1: paper transport mechanism, 2...: transport roller unit, 2s: transport roller unit targeted for jam processing, 3...: roller, 3s: one roller (upper roller), 3sp: one roller (upper roller) One side, 4...: Roller, 4s: Other roller (lower roller), 4sp: One side of the other roller (lower roller), 6: Roller operation part, 16: One-way clutch, 17: Operation knob, R: Paper Conveyance path, M: Printer, Lh: Displacement amount for separation, P: Print paper, Ps: Thick paper, Psr: Curved portion of Psf: Thick paper surface, Fa: Axial direction, Fs: Right angle direction, Fp : Parallel direction

Claims (7)

A jam processing method for a printer for processing a jam generated by a thick paper serving as a print paper transported by a paper transport mechanism including a transport roller unit having a pair of upper and lower rollers arranged at predetermined intervals along a paper transport path. During the jam processing, after displacing only one side in the left and right direction of one roller in the conveyance roller portion to be jammed away from the other roller, the one roller or the other roller is rotationally displaced. A method for removing jam of a printer, wherein a curved portion for removing the cardboard is formed on one side of the cardboard in the left-right direction. The displacement amount by which one side in the left-right direction of the one roller is displaced away from the other roller is such that the pressure contact of the one side of the one roller is released, and the one side of the one roller and the one side thereof are opposed to each other. 2. The jam clearance method for a printer according to claim 1, wherein the rotational displacement of one side of the other roller is set to an amount that is not transmitted to the cardboard. A one-way connection is provided which includes a roller operating section for rotationally displacing the one roller or the other roller by a manual operation, and the roller operating section is connected by inputting rotational displacement of the one roller or the other roller. 3. The jam clearance method for a printer according to claim 1, further comprising a clutch and an operation knob provided integrally with the one-way clutch. The jam processing method for a printer according to claim 1, wherein the one roller is a pinch roller arranged on an upper side. 5. The jam processing method for a printer according to claim 1, wherein the other roller is a drive roller arranged on the lower side. The jam clearance method for a printer according to claim 1, wherein a direction in which the one roller is displaced away from the other roller is a direction perpendicular to a paper surface of the cardboard. .. The jam clearance method for a printer according to claim 1, wherein a direction in which the one roller is displaced away from the other roller is a direction parallel to a paper surface of the cardboard. ..

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