JP4276018B2 - Sheet feeding control device and printer provided with the same - Google Patents

Description

The present invention relates to a sheet feeding control device and a printer using the same.

  Similarly, the motor located below the sheet feeding path causes the rotational movement of the gear located below the sheet feeding path from the crank gear located below the sheet feeding path in the crank mechanism. Converted to reciprocating motion by the arm part (connecting rod) of the crank mechanism extending above the mechanism, and fed along the sheet feeding path according to the reciprocating position of the upper end of the arm part located above the sheet feeding path A printer having a friction applying mechanism (friction device) that presses a sheet to be pressed downward from above the feeding path by a roller to increase or decrease a friction engagement force with the sheet is known (Patent Document 1).

However, since the adjustment position of the reciprocating movement of the arm or connecting rod used for adjusting the pressing force is limited to a relatively narrow range, the drive system of the friction applying mechanism is not used elsewhere. Therefore, the utilization efficiency was relatively low.
JP 2003-137451 A

  The present invention has been made in view of the above-described points, and an object of the present invention is to utilize the motion of a drive mechanism that reciprocates a friction applying mechanism within a predetermined range for other operation control related to sheet feeding. Thus, it is an object of the present invention to provide a sheet feeding control device and a printer using the same.

In order to achieve the above object, the sheet feeding control device according to the present invention converts the rotational motion of the first rotating body into a reciprocating motion by the rotation / reciprocating motion conversion means, and the frictional force on the sheet according to the position of the reciprocating motion. The friction applying mechanism for increasing or decreasing the resultant force, and the rotation position of the flap that defines the sheet feeding path to change the feeding path of the sheet fed by the friction applying mechanism according to the rotational position of the first rotating body. A sheet feeding control device having a flap rotation position adjustment mechanism for adjusting , wherein the flap rotation position adjustment mechanism is configured to move the first rotation body when the first rotation body is rotated in the forward direction. A one-way clutch mechanism that transmits the rotation of the second rotating body in one direction and rotates the rotation of the first rotating body in the opposite direction to the second rotating body; The rotation of the second rotating body in the one direction And a flap pivot position adjusting means for adjusting the rotational position of said flap defining said sheet feeding path in response to.
In the following description of the specification, a part that does not satisfy the condition described in this paragraph is out of the scope of the device invention described in the claims in terms of the wording.

  In the sheet feeding control device according to the present invention, “friction application that converts the rotational motion of the first rotating body into reciprocating motion by the rotation / reciprocating motion conversion means and increases or decreases the frictional engagement force to the sheet according to the position of the reciprocating motion. Since the mechanism is provided, a large number of related mechanisms and parts including the first rotating body and its rotational drive source are arranged on one side (typically the lower side) of the sheet feeding path. The rotation of the base end portion located on the one side of the sheet feeding path among the reciprocating parts of the rotation / reciprocating conversion means is located on the other side (typically the upper side) of the sheet feeding path. A state in which most part of the drive control system is arranged on one side of the sheet feeding path because it can be converted into a reciprocating movement of the leading end, and the frictional engagement force with respect to the sheet can be increased or decreased according to the reciprocating movement of the leading end. To give the sheet a desired frictional engagement force according to the sheet characteristics. Door is possible. In the sheet feeding control device according to the present invention, in addition to the friction applying mechanism as described above, “the feeding path of the sheet fed by the friction applying mechanism is changed according to the rotational position of the first rotating body. The flap rotation position adjusting mechanism for adjusting the rotation position of the flap that defines the sheet feeding path is provided. Therefore, the rotation of the flap is performed using the rotational motion of the first rotating body of the friction applying mechanism. The sheet feeding path can be changed by adjusting the moving position. Here, since the rotational position of the first rotating body defines the frictional engagement force with respect to the sheet of the friction applying mechanism, the type of sheet (cut sheet or continuous sheet or the like) and the sheet thickness (multiple sheets) Friction rotation position depending on the type of sheet such as whether the sheet is cut paper or continuous paper Both the adjustment of the sheet feeding path by the adjustment can be simultaneously performed by adjusting the rotational position of the first rotating body. Therefore, it is possible to improve the utilization efficiency of related parts related to the friction applying mechanism.

  In the sheet feeding control apparatus according to the present invention, the sheet is typically made of paper, but may be another type of sheet such as a plastic sheet instead of paper (hereinafter, for the sake of simplicity, a plastic sheet is used). The term “paper” may be used to mean “sheet” in the broad sense as described above, including manufactured sheets and the like).

  In the sheet feeding control device of the present invention, the sheet may be cut paper or continuous paper. Typically, in the case of cut paper, the friction applying mechanism is adjusted or positioned so as to increase the frictional engagement force, and the continuous In the case of paper, the friction applying mechanism is adjusted or positioned so as to reduce the frictional engagement force.

  In the sheet feeding control device of the present invention, for example, when the friction applying mechanism is set in a state suitable for feeding the cut sheet because the frictional engagement force applied by the friction applying mechanism is large, the cut sheet The flap is positioned so that the sheet is discharged to a cut paper stacker suitable for receiving paper, and the friction application mechanism is set to a state suitable for feeding continuous paper because the frictional engagement force applied by the friction application mechanism is small In this case, the flap is positioned so that the sheet is discharged to a continuous paper discharge unit suitable for receiving the continuous paper.

  Further, the friction applying mechanism and the position of the flap may be controlled not only according to whether or not the sheet is continuous paper but also according to the thickness of the sheet and the slipperiness.

  Further, for example, when the sheet is a thick sheet such as a polymer of a plurality of paper sheets, when the frictional engagement force tends to increase due to the thickness, the nip part (clamping part) for clamping the sheet The friction application mechanism is controlled so that the frictional engagement force applied by the friction application mechanism is prevented from becoming excessively high by making the gap of the gap relatively large. The friction applying mechanism may be controlled so that the frictional engagement force applied by the friction applying mechanism is increased by relatively reducing the frictional force. Also in this case, the position of the flap may be controlled to switch the sheet discharge portion depending on the thickness of the sheet, but instead, it depends on the number of sheets of superposed paper sheets rather than the total thickness of the sheet. The flap position may be controlled to switch the sheet discharge section.

  In the sheet feeding control device of the present invention, the rotating body typically includes a gear, but all or part of the rotating body is a roller that rotates by frictional engagement instead of a gear that rotates in mesh. A belt that circulates may be used.

  In the sheet feeding control apparatus of the present invention, the rotation / reciprocation conversion means typically comprises a crank mechanism, but instead of the rotation / reciprocation conversion means such as a cam and a follower. Here, the reciprocating part typically takes the form of an elongated arm or rod, with the proximal end side positioned on one side of the sheet feeding path and the middle part of the rod crossing the sheet feeding path at a detour position. Since the leading end is positioned on the other side of the sheet feeding path, it is necessary to provide a drive source on one side of the sheet feeding path and to apply friction from the other side of the sheet feeding path. A pressing force can be applied.

The sheet feed control apparatus of the present invention, flap rotational position adjusting mechanism to transmit the rotation of said first rotary member to the second rotating body when the first rotating body is rotated in the forward direction The one- way clutch mechanism that rotates the second rotating body in one direction and does not transmit the rotation in the reverse direction of the first rotating body to the second rotating body, and according to the rotation of the second rotating body in the one direction. And flap rotation position adjusting means for adjusting the rotation position of the flap that defines the sheet feeding path.

  In this case, the rotation position of the flap can be adjusted according to the magnitude of the frictional engagement force applied by the friction applying mechanism by selecting the operating range of the one-way rotating clutch mechanism.

  In the sheet feeding control apparatus according to the present invention, the flap rotation position adjusting unit may transmit the rotation of the second rotating body to the flap by a desired power transmission unit. Since it is located on one side of the supply path, the flap rotation position adjusting means is preferably an eccentric position of the second rotating body, for example, to convert the rotation of the second rotating body in the one direction into a reciprocating motion. A connecting rod that is rotatably connected to one end side, and a connecting arm portion that is rotatably connected to the other end of the connecting rod at one end and the other end is connected to the base end of the flap.

  In this case, when the rotation / reciprocation converting means is composed of, for example, a crank mechanism, even if the state of the friction applying mechanism (friction applying position) is determined, the flap rotating position defined by the flap rotating position adjusting means is selected. Therefore, it is possible to adjust the rotational position of the flap regardless of the frictional engagement force applied by the friction applying mechanism.

  In the sheet feeding control device of the present invention, the flap is typically fixed so as to take a predetermined rotational position with respect to the shaft. However, in some cases, they may be coupled so as to be relatively rotatable with a certain amount of play. For example, when the base end portion of the flap is “connected” to the other end of the connecting arm portion of the flap rotation position adjusting means, the flap typically has a certain angular relationship with the connecting arm portion. In addition, although the base end portion of the flap is “fixed” to the other end portion of the connecting arm portion, the flap can be rotated relative to the connecting arm portion within a desired angle range. The base end portion of the connecting arm portion may be coupled to the other end portion of the connecting arm portion. In the latter case, even if the flap is set at a desired rotation position, for example, when the seat is moved from the downstream side toward the upstream side and hits the flap, the flap is freely rotated within a desired angle range. Thus, the reverse movement or feeding of the sheet is allowed.

  In the sheet feeding control device of the present invention, it is typically desired that the occupied space is minimized, and the majority of related parts related to the sheet feeding control are arranged on one side of the sheet feeding path. The other side is used for sheet feeding control in a device such as a printer in which it is difficult to provide a space other than a limited one such as a lid or a part of a case housing. However, it may be used for sheet feeding control in a copying machine or other office equipment.

  When the sheet feeding control device of the present invention is incorporated in a printer, the printer typically has a dot impact printer capable of simultaneous printing or printing of superposed paper sheets including continuous paper such as continuous forms and carbon paper. However, other types of printers may be used if desired as long as printing on sheets having different characteristics is possible.

  In the above, typically, the friction applying mechanism is configured to apply a frictional engagement force to the sheet on the downstream side of the print head in the sheet feeding direction. In that case, the sheet can be fed with a desired tension applied to the sheet. In this case, since the flap can be arranged close to the sheet feeding mechanism located downstream of the print head, the flap rotation position adjusting mechanism is coupled to the friction applying mechanism without occupying excessive space. It is easy to be done. The friction applying mechanism may be provided not only on the downstream side of the print head but also on the upstream side, and the flap for defining the sheet feeding path is provided not only on the downstream side of the print head but also on the upstream side. Also good.

  Several preferred embodiments of the present invention will be described based on preferred examples shown in the accompanying drawings.

  In the printer 1 according to a preferred embodiment of the present invention shown in FIG. 1, printing is performed while the sheet is moved in the J1 direction from left to right in FIG. 1, typically from the left end side to the right end side. In the printer 1, typically, the left side of FIG. 1 is the front or the front, the right side is the back or the rear, and the right side wall is omitted from the front to the rear, as shown in FIG. Yes. Therefore, a side wall (right side wall) similar to the side wall located behind in FIG. 1, that is, the left side wall 3 is on the front side of the drawing.

  The printer 1 includes a cut paper feed tray 21 and a continuous paper supply tractor 22 on one end A side of a paper feed path P defined by the paper guide 10, and a cut paper stacker 23 (see FIG. 2) and a continuous paper discharge tray 24.

  A flap 25 is provided between the paper feed tray 21 or tractor 22 and the paper guide 10. The flap 25 is a cut sheet feeding position for guiding the cut sheet from the sheet feeding tray 21 to the sheet guide 10 and the continuous sheet from the tractor 22 is moved to the front section Pf of the sheet feeding path P in the front section 11 of the sheet guide 10. It is movable between a continuous paper feeding position that allows feeding. The position of the flap 25 may be changed manually or controlled by a flap position control mechanism (not shown).

  Further, a flap 26 is provided between the paper guide 10 and the cut paper stacker 23 (FIG. 2) and the tractor 24 (solid line in FIG. 1 or broken line in FIG. 2). The flap 26 is a cut sheet delivery position E1 (solid line in FIG. 2) that guides the discharge or delivery of cut sheets from the rear portion Pr of the sheet feed path P to the cut sheet stacker 23 in the rear portion 12 of the paper guide 10. And a continuous paper feed position E2 (imaginary line in FIG. 2) that allows the continuous paper to be discharged or sent from the rear portion Pr of the paper feed path P to the tractor 24, and the positions E1, Position control between E2 is performed by a flap position adjusting mechanism 80 described in detail later.

  A printing mechanism 30 is provided in the central portion Pc of the paper feeding path P. The printing mechanism 30 has left and right side walls 3 and 3 (although the right side wall is not shown as described above, the left side wall is substantially the same as the left side wall. ) Between the carriage 32 movably supported in the X1 and X2 directions by a pair of guide shafts 31 extending in the direction X perpendicular to the plane of FIG. 1, and the print head 33 mounted on the carriage 32 A ribbon guide 34 is formed on the front surface of the print head 33 so as to face the central portion 10 c of the paper guide 10. Further, the printing mechanism 30 is arranged between the side walls 3 and 3 below the paper guide 10 so that a circumferential surface serving as a printing force support surface is located along the central portion 10c of the paper guide 10 at a position facing the print head 33. And a platen 38 installed on the wall.

On the upstream side and the downstream side of the printing mechanism 30 with respect to the paper feeding direction J1, upstream and downstream paper feeding mechanisms 40 and 50 are formed. The upstream sheet feeding mechanism 40 includes an upstream drive roller 41 and an upstream driven roller 42, and the drive roller 41 is rotationally driven by a drive mechanism (not shown), so that the driven roller 42 and the drive roller 41 are connected to each other. The paper elastically sandwiched between them is fed in the J1 direction. The driven roller 42 is elastically pressed against the surface of the sheet toward the driving roller 41 by an elastic pressing mechanism (not shown), and a desired frictional engagement force is generated between the driving roller 41 and the sheet. Give. The pressing mechanism of the driven roller 42 may be configured similarly to the pressing mechanism (friction applying mechanism) of the driven roller 52 described below, or may have a different structure.

  Similarly to the upstream paper feeding mechanism 40, the downstream paper feeding mechanism 50 also has a downstream driving roller 51, a downstream driven roller 52, a driving mechanism (not shown) that rotationally drives the driving roller 51, and a driven machine. The roller 52 is elastically pressed against the surface of the sheet toward the driving roller 51, that is, elastically pressed, and has a friction applying mechanism or a friction mechanism 60 that applies a desired frictional engagement force between the driving roller 51 and the sheet.

  As shown in FIG. 1 and FIG. 2 partially enlarged, the friction applying mechanism 60 includes a pulse motor or step motor 61 as a drive motor capable of forward and reverse rotation, and a pinion or small gear on the output shaft of the step motor 61. Meshed with the first intermediate gear 62 rotated in mesh with the first intermediate gear 62, meshed with the second intermediate gear 63 rotated in mesh with the small gear 62 a coaxial with the first intermediate gear 62, and meshed with the second intermediate gear 63 The crank gear 64 rotated, the arm (connecting rod) 65 rotatably connected to the eccentric pin 64a of the crank gear 64 at one end 65a, and the pin 65b at the other end of the arm 65 are loosely fitted. A long hole defining portion 3a having a long hole 67, a tension spring 68 whose one end is locked to a pin 65b, and a shaft portion 71 supported between the side walls 3 and 3 are rotated in the directions D1 and D2. A pair of free The other end of the tension spring 68 to a resilient contact force adjusting lever 70 having a part 72, 73 has a one coupled to the distal end 72a of the proximal arm portion 72. A notch 74 is formed in the distal arm 73 of the lever 70, and a shaft 52 a of the downstream driven roller 52 is rotatably fitted in the notch 74. The long hole defining portion 3 a is a portion that is stationary with respect to the base portion 4 or the like of the printer 1, for example, a part of the side wall 3.

  The tip of the end portion 65a of the arm 65 is shielded when crossing the optical path of position detecting means (not shown) such as a photo interrupter having a light emitting element, a light receiving element, and a reflecting mirror. The positioning shielding portion 66 is provided so that the position detecting means can detect that it is located at a predetermined detected position (reference position), and the positioning shielding portion 66 is provided between the light emission and light receiving elements of the photo interrupter. When the arm 65 and the crank gear 64 are considered to be in the reference position, the position of the pin 65b is determined by detecting the rotation angle of the crank gear 64 with respect to the reference position (indirectly). Detected). The reference position is typically the lower end of the long hole 67, that is, the lower end position L1 of the pin 65b. However, if desired, even if it is the upper end position U1 corresponding to the upper end of the long hole, the position L1 and the position U1. It may be an intermediate position. Further, as long as the reciprocating swing position of the arm 65 can be detected, other means such as the rotational position of the crank gear 64 itself or the reciprocating position of the pin 65b itself may be used even if the lower end of the arm 65 is detected by other means. You may make it detect the position of a part with a desired detection means.

  In the friction applying mechanism 60, the pin 65b of the arm (connecting rod) 65 has a lower end position L1 corresponding to the lower end of the long hole 67 and an upper end position corresponding to the upper end of the long hole 67 (position indicated by an imaginary line in FIG. 2) U1. Between them, the turning force in the direction D1 of the lever 70 by the tension spring 68 increases as it approaches the upper end position U1, and the pressing force in the direction F1 of the driven roller 52 against the paper by the arm 73 increases. That is, in the friction applying mechanism 60, the crank gear 64 is in a rotational position corresponding to the lower end position L1 of the pin 65b of the arm 65, that is, the eccentric pin 64a of the crank gear 64 is in the lower end side position near the lower end (the solid line in FIG. 2). 2) and the rotation position corresponding to the upper end position U1 of the pin 65b of the arm 65, that is, the upper end side position in the vicinity of the upper end of the eccentric pin 64a of the crank gear 64 (imaginary in FIG. 2). The friction applying force of the guide roller 52 via the lever 70 is adjusted according to the rotation position taken within the angle range G between the rotation position at the position U2 and the rotation position at U2. Accordingly, by driving the step motor 61 forward and backward so that the pin 64a takes a desired rotation position between the lower end side position L2 and the upper end side position U2 within the angle range G, the second intermediate gear 63 is moved. By rotating in the K1 and K2 directions, the frictional engagement force applied to the paper by the friction applying mechanism 60 is adjusted.

  The flap rotation position adjusting mechanism 80 includes a first gear portion 81a and a second gear portion 81c coupled to the gear portion 81a via a one-way clutch portion 81b, and meshes with the crank gear 64 at the first gear portion 81a. The gear mechanism 81 with a one-way clutch, the crank gear 82 meshed with the second gear portion 81c of the gear mechanism 81, and the eccentric pin 82a of the crank gear 82 are rotatably fitted by a fitting portion 83a on one end side. The first arm 83 includes a first arm 83 and a second arm 85 fitted to a distal end portion 83b of the first arm 83 via a pin 84 so as to be rotatable at a base end portion 85a. The second arm 85 is fixed to a shaft portion 86 that is rotatably supported between the side walls 3 and 3 at a distal end portion 85b. Further, a flap 26 is fixed to the shaft portion 86 by a base end portion 26a. Accordingly, the distal end portion 85 b of the second arm 85 is fixed to the proximal end portion 26 a of the flap 26 via the shaft portion 86, and the second arm 85 is configured to maintain a constant angle H with respect to the flap 26. ing. Here, the flap rotation position adjusting means includes an eccentric pin 82 a, first and second arms 83 and 85, a pin 84 therebetween, and a shaft 86.

  A positioning shielding portion 83d similar to the positioning shielding portion 66 of the arm portion (connecting rod) 65 of the crank mechanism of the friction applying mechanism 60 is also provided at the proximal end portion of the arm 83 of the crank mechanism of the flap rotation position adjusting mechanism 80. It is detected that the arm portion 83 is at the reference position (passed through the predetermined reference position) by a position detection unit such as a photo interrupter that detects passage of the positioning shielding portion 83d at a predetermined position. The

  Therefore, in the flap rotation position adjusting mechanism 80, the crank gear 64 is rotated in the M1 and M2 directions in accordance with the rotation of the second intermediate gear 63 of the friction applying mechanism 60 in the K1 and K2 directions, so that the position of the pin 65b is changed. When the long hole 67 is moved in the longitudinal direction, the first gear portion 81a of the one-way clutch gear mechanism 81 is rotated in the N1 and N2 directions according to the rotation of the crank gear 64 in the M1 and M2 directions. Of the rotations in both directions of the first gear part 81, for example, only the rotation in the N1 direction is transmitted to the second gear part 81c via the one-way clutch part 81b, and the second gear part 81c is rotated in the N1 direction. The crank gear 82 is rotated in the Q1 direction according to the rotation of the second gear portion 81c in the N1 direction. As a result, when the first arm 83 is in the reverse rotation position LF indicated by the solid line, the pin 84 at the distal end of the arm 83 is in the reverse swing position LF1, and the proximal pin 82a is in the reverse position LF2. When one arm 83 is at the projecting position UF indicated by an imaginary line, the pin 84 at the distal end of the first arm 83 is in the projecting swing position UF1 and the pin 82a on the base end side is in the projecting rotation position UF2. The first arm 83 of the crank mechanism substantially reciprocates between a retracted position LF indicated by a solid line and a protruding position UF indicated by an imaginary line. Here, when the first arm 83 is in the retracted position LF indicated by the solid line, the second arm 85 is rotated in the H1 direction as indicated by the solid line, and the predetermined position with respect to the second arm 85 is determined. When the flap 26 fixed at the angle H takes the cut sheet feeding position E1 indicated by the solid line and the first arm 83 is at the protruding position UF indicated by the imaginary line, the second arm 85 is also indicated by the imaginary line. As described above, the flap 26 fixed at a predetermined angle H with respect to the second arm 85 takes the position rotated in the H2 direction, and takes the continuous paper feeding position E2 indicated by an imaginary line.

  In the printer 1 having the sheet feeding control device 2 including the friction applying mechanism 60 and the flap position adjusting mechanism 80 configured as described above, the first rotation wheel 62 of the motor 61 drives the first intermediate wheel 62 through the first intermediate wheel 62. 2 When the intermediate wheel 63 is rotated in the K1 and K2 directions, the crank gear 64 of the friction applying mechanism 60 is reciprocated in the M1 and M2 directions within the angle range G, and the pin 65b is positioned in the elongated hole 67. The crank gear 82, which is reciprocated between L1 and position U1 and positioned at a predetermined position and is coupled to the friction applying mechanism 60 via the one-way clutch 81b in the flap position adjusting mechanism 80, moves in the Q1 direction. The eccentric pin 82a reciprocates between the positions LF2 and UF2 along with the rotation in the Q1 direction, whereby the second arm 85 The first arm 83 flap 26 which is connected to is between, the pivots H1, H2 direction of the continuous paper feed position E2 and cut sheet feeding position E1 through.

  Accordingly, for example, when the pin 65b of the friction applying mechanism 60 is at the position L1 indicated by the solid line in FIG. 2 and the friction engagement force applied to the paper by the roller 52 is minimized, the flap 26 is indicated by the imaginary line in FIG. E2 is adopted, and when the pin 65b of the friction applying mechanism 60 is at the position U1 indicated by the imaginary line in FIG. 2 and the friction engagement force applied to the paper by the roller 52 is maximized, the flap 26 is indicated by the solid line in FIG. By selecting the number of teeth of the crank gear 64, the clutch-equipped gear mechanism 81, and the crank gear 82 so as to adopt E1, in the case of continuous paper, the frictional engagement force is minimized and sent to the tractor 24. In the case of a cut sheet, the sheet feeding control can be performed so that the frictional engagement force is maximized and the sheet is fed to the stacker 23.

  The two positions E1 and E2 of the flap and the rotation positions of the lever 70 in the D1 and D2 directions (positions U1 and L1 in the long hole 67 of the pin 65b) correspond to one-to-one (the pin 65b is a long hole). For example, while the pin 65b moves from the position L1 to the position U1 in the long hole 67, instead of making the crank gear 82 rotate 0.5 times while moving from the position L1 to the position U1 in the position 67, In addition, different conditions may be set such that the crank gear 82 rotates 1.5 times. In that case, when the flap 26 is positioned at the position E2 for opening the path for sending cut paper or the like to the stacker 23 or the position E1 for opening the path for sending continuous paper or the like to the tractor 24, there are two types for the same flap position. The sheet feeding can be controlled so that the above frictional engagement force can be applied (a desired frictional engagement force is selected from two or more types of frictional engagement force). However, in this case, for example, the rotation of the crank gear 82 is controlled by counting the number of passages as well as whether or not the positioning shielding portion 83d has passed a predetermined detection position.

  Further, if desired, the flap 26 may be directly coupled to the crank gear 64 of the friction applying mechanism 60 via a gear mechanism. However, the flap 26 crosses the side of the paper feeding path from the lower side to the upper side. In order to transmit the power up to, it is preferable to use an elongated mechanism such as the crank mechanisms 82 and 83 having the arm 83. In this case, the crank gear 82 may be engaged with the crank gear 64 directly or via a gear mechanism to reciprocate the crank gear 82. For example, the position of the flap 26 and the rotation of the lever 70 may be used. In order to increase the degree of freedom of the relative positional relationship with the moving position, it is preferable to interpose the one-way clutch 81b.

In the above description, the example in which the flap 26 is fixed to the second arm 85 so as to have a certain angle H has been described. However, as shown in FIG. Thus, it may be rotatable within a predetermined angle range. The modification (embodiment 2) shown in FIG. 4 is substantially the same as the embodiment 1 shown in FIGS. 1 to 3 except for the differences mentioned below.

  In the modification shown in FIG. 4, as can be seen from (b), the flap 26 is fixed to the pivot shaft 86 at the base end portion 26a, and the pivot shaft 86 is a bearing of the side walls 3 and 3 at both ends. It is instruct | indicated so that rotation is possible by the part (not shown). A V-shaped groove 91 extending in the axial direction is formed on the peripheral surface of the one end side portion of the shaft 86. In the example shown in FIGS. 4C and 4D, the angle α between the two side walls 92 and 93 forming the V-groove 91 is about 90 degrees. Larger or smaller.

  In this example, the second arm 85 of the flap position adjusting mechanism 80 has a V-shaped protrusion 95 on a part of the peripheral surface of the cylindrical hole 94 that receives the shaft 86 of the end 85b. A protruding portion 95 is loosely fitted in the V groove 91 of the shaft 86. The angle β between the side surfaces 96 and 97 forming the V of the V-shaped protrusion 95 is smaller than the angle α between the side surfaces of the V groove 91, and this angle difference γ = α−β is the flap position adjusting mechanism 80. The range of relative rotation of the flap 26 with respect to the second arm 85 is defined. That is, even when the second arm 85 is in a certain tilting or swinging position, the flap 26 has a V-shaped side surface 92 of the V groove 91 of the shaft 86 in the hole 94 of the second arm 85 of the flap position adjusting mechanism 80. The downward position T1 that contacts the side surface 96 of the protrusion 95 (the position shown by the solid line in FIG. 4A and the state shown in FIG. 4D) and the side surface 93 of the V-groove 91 are second. The lateral position T2 (the position indicated by the broken line in FIG. 4A and the state shown in FIG. 4C) that contacts the side surface 97 of the V-shaped projection 95 of the hole 94 of the arm 85. In the meantime, within the range of the angle γ, relative rotation with respect to the second arm 85 in the H2 and H1 directions is possible. Since the flap 26 is cantilevered at one end (base end) 26a, the flap 26 takes a position T1 that is rotationally biased in the H1 direction by its own weight unless other external force is applied. Further, the flap 26 has a tapered portion 26c formed on the back surface at the lower end thereof.

  The printer 1a having the sheet feeding control device 2a configured as described above can perform not only the operations described in relation to FIGS. 1 to 3, but also, for example, as shown in FIG. When the flap 26 is at the cut sheet feeding position E1, as shown by the arrow V1, the sheet can be fed from the back side (the right side of the drawing), and a desired sheet feeding mechanism (not shown). Thus, when the paper is fed in the V1 direction, the leading edge of the paper introduced in the V1 direction hits the taper portion 26c of the flap 26 and exerts a force in the H2 direction on the flap 26. Since the flap 26 can freely rotate in the H2 direction within the range of the angle γ because of the gap between the V-groove 91 and the V-shaped projection 95, the sheet H2 moves the flap 26 from the position T1 toward the position T2. It can be pushed up in the direction and fed into the central portion of the printing mechanism 30 to perform desired printing. As a result, further movement variations can be provided for the flap 26 that is aligned between the position E1 and the position E2.

  As long as the flap 26 and the second arm 85 can be relatively rotated within a desired angle range, the structure for allowing the relative rotation and limiting the angle range is as shown in FIG. For example, as shown in FIGS. 5A and 5B, a V-shaped projection 95 is provided between the flap 26 and the shaft 86 so as to allow relative rotation of both. Similar V-shaped protrusions 95 a and V grooves 91 a similar to the V grooves 91 may be formed. In that case, typically, the end portion 85b of the second arm 85 is fixed or locked to the shaft 86 so as not to be relatively rotatable.

FIG. 3 is a cross-sectional explanatory view of a printer according to a preferred embodiment of the present invention having a sheet feeding control device according to a preferred embodiment of the present invention. FIG. 2 is an enlarged explanatory view of a portion including a friction applying mechanism and a flap rotation position adjusting mechanism in the printer of FIG. 1. III-III sectional view explanatory drawing of FIG. FIG. 2 is an enlarged view of a periphery of a flap and its mounting portion of a modified example of the printer of FIG. 1, wherein (a) is an explanatory view similar to FIG. 2 (however, only some elements are shown), (b) ) Is an upper surface explanatory view showing a state of attachment of the flap, (c) is an explanatory view showing an enlarged state of the loose fitting portion when the flap is in a lateral direction (lifting) position, and (d) is a downward view of the flap. Explanatory drawing which expanded and showed the state of the loose fitting part in a (stable) position. 4A and 4B show a modification example of how to attach the flap of FIG. 4, wherein FIG. 4A is an explanatory view when the flap is in the same position as FIG. 4C, and FIG. Explanatory drawing in the case of being in the same position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1a Printer 2,2a Sheet feeding control apparatus 3 Side wall 4 Base 10 Paper guide 22 Tractor 23 Cut paper stacker 24 Discharge tray (tractor)
25 flap 26 flap 26a base end portion 30 printing mechanism 31 guide shaft 32 carriage 33 print head 34 paper guide 38 platen 40 upstream paper feeding mechanism 41 upstream driving roller 42 upstream guide roller 50 downstream paper feeding mechanism 51 downstream Side drive roller 52 Downstream guide roller 60 Friction applying mechanism 61 Step motor 62 First intermediate gear 63 Second intermediate gear 64 Crank gear 64a Eccentric pin 65 Arm (connecting rod)
67 Long hole 68 Tension spring 70 Elastic contact force adjusting lever 71 Shaft portion 72, 73 Arm portion 74 Notch portion 80 Flap position adjusting mechanism 81 One-way clutch gear mechanism 81a First gear portion 81b One-way clutch portion 81c Second gear portion 82 Crank gear 82a Eccentric pin 83 First arm 84 Pin 85 Second arm 86 Shaft portion 91, 91a V groove 9293 Side surface 95, 95a V-shaped projection 96, 97 Side surface D1, D2 Rotating direction E1 Cut sheet discharge position E2 Continuous Paper feeding position F1 Pushing force acting direction G Angular range H Constant angle H1, H2 Turning direction L1 Lower end position L2 Lower end side position P Paper feeding path Pc Central part Pr of paper feeding path Rear part T1 of paper feeding path Downward position T2 Lateral position U1 Upper end position U2 Upper end side position α, β Angle

Claims (5)

A friction applying mechanism for converting the rotational motion of the first rotating body into a reciprocating motion by a rotation / reciprocating motion converting means and increasing or decreasing a frictional engagement force with respect to the sheet according to the position of the reciprocating motion; and rotation of the first rotating body A sheet feeding control having a flap rotation position adjusting mechanism that adjusts a rotation position of a flap that defines a sheet feeding path so as to change a feeding path of a sheet fed by the friction applying mechanism according to a position. A device ,
The flap rotation position adjusting mechanism transmits the rotation of the first rotating body to the second rotating body when the first rotating body is rotated in the forward direction so that the second rotating body is integrated with the second rotating body. A one-way clutch mechanism that rotates in the direction and does not transmit the reverse rotation of the first rotating body to the second rotating body, and the sheet feeding path according to the one-way rotation of the second rotating body And a flap rotation position adjusting means for adjusting a rotation position of the flap for regulating the sheet . A connecting rod in which the flap rotation position adjusting means is rotatably connected to an eccentric position of the second rotating body at one end side so as to convert the rotation of the second rotating body in the one direction into a reciprocating motion. The sheet feeding control device according to claim 1 , further comprising: a connecting arm portion rotatably connected to the other end portion of the connecting rod at one end and the other end connected to a proximal end portion of the flap. The sheet feeding control device according to claim 1 or 2 , wherein cut sheets and continuous sheets can be selectively used as the sheets. A printer comprising the sheet feeding control device according to any one of claims 1 to 3 . The printer according to claim 4 , wherein the friction applying mechanism is configured to apply a frictional engagement force to the sheet on the downstream side of the print head in the sheet feeding direction.

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