JP2008127130A - Sheet-fed printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet-fed printing machine in which predetermined origins are set on independent drive sources. <P>SOLUTION: This sheet-fed printing machine generally comprises a main controller 31, a motor peripheral device 32 for the second drive source (for driving a separator), and a motor peripheral device 33 for the third drive source (for driving a paper feed roller). The motor peripheral device 32 for the second drive source comprises a servo-amplifier 35, the motor 36 with an encoder 39, and a timing sensor 34 for origin confirmation. The motor peripheral device 33 for the third drive source is also formed in a same structure. The second and third drive sources have predetermined origins for reference of control, respectively, and controlled in reference to the origins. Specifically, the second drive source has, as the origin, a reference point for the periodical operations of the separator. Also, the third drive source has, as the origin, a reference point for one cycle of operation of a feeder belt. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sheet-fed printing machine, and more particularly, to a sheet-fed printing machine having a drive source independent of a main drive source of a printing unit in a sheet feeding unit.

  FIG. 5 is an external view showing a configuration example of the entire conventional sheet-fed printing machine. In general, a sheet-fed printing machine 71 for color printing includes a paper feeding unit 75, printing units 73 a, 73 b, 73 c and 73 d for each color, and a paper discharge unit 74. The conveyance from the paper feeding unit 75 to the first color printing unit 73a is configured such that the sheet held by the separator provided in the paper feeding unit 75 is conveyed by a feed mechanism such as a feeder board having a feeder belt. Adopted.

  FIG. 6 is a cross-sectional view showing the paper feed unit 75. As shown in FIG. 6, the sheet feeding unit 75 sucks the stacked sheet sheets (hereinafter referred to as “paper sheets”) 93 one by one by the gripping units 91 and 92 in the sheet feeding device 72. In addition, a separator 90 that feeds forward is provided. Further, the sheet sheet fed forward by the separator 90 is placed on the feeder belt 105 having a holding roller that is operated by a cam, and is fed forward until it hits the front pad 106 that is a partition. The feeder belt 105 is rotatably supported by rollers 98, 102, 104, and 103.

  The drive source of the feed mechanism including the feeder belt 105 and the like is a gear 98. The gear 98 is rotated by acceleration / deceleration by non-circular gears 99 and 100. The non-circular gear 100 is commonly driven by a belt 88 that rotates a gear 95 that drives a separator 90 via a cam 86 and a universal joint 87. The belt 88 is rotatably supported by a gear 95, a pulley 96, a gear 97, a non-circular gear 100, a gear 101, and a pulley 94.

  The gear 101 is driven by the chain 110 from the sprocket 107 connected to the drive gear train of the first color printing unit 109 using the sprockets 112, 113, 114, and 111. Thus, after all, the driving of the separator 90 and the driving of the feeder belt 105 with acceleration / deceleration use one driving source 107 that drives the printing unit 73 from the first color and the paper discharge unit 74 as a driving source. (For example, Patent Document 1). Needless to say, the main drive source motor is also a drive source for the printing roller group of the sheet.

Japanese Patent Laid-Open No. 11-59948

  However, since the driving timing of the separator 90 and the driving timing of the feeder belt 105 are linked using one main driving source (motor) as a driving source, the timing of each part must be adjusted by mechanical adjustment. It took time and effort. Specifically, the bolts that support the gears and pulleys are loosened, the gears and the shaft are shifted in phase, and the bolts are adjusted again by bolting. In addition, since the drive power train is connected to a large number of gears and pulleys, there are many refueling points and refueling work takes time and effort.

  Accordingly, the present invention has been made in view of the above, and a drive source independent of the main drive source of the printing unit is provided as a drive source of the separator and the feed mechanism, and an origin for synchronizing the drive sources. It is an object of the present invention to provide a sheet-fed printing machine having each of the drive sources.

  In order to achieve the above object, a sheet-fed printing machine according to the present invention is a sheet-fed printing machine in which a separator of a paper feeding unit and a feed mechanism for conveying a paper sheet to a printing unit are driven in synchronization. , And each of the feed mechanisms has a second drive source and a third drive source independent of the first drive source for driving the printing unit, and the second drive source and the third drive source. The drive source has a predetermined origin as a reference for control and is controlled based on the origin.

  If each of the separator and the feed mechanism has a second drive source and a third drive source that are independent from the first drive source (main drive source) that drives the printing unit, the separator and the feed mechanism Since it is driven independently, many mechanical parts such as a chain for transmitting the driving force from the motor as the first driving source, a sprocket gear (including a sprocket), and a clutch for turning on / off the driving force are included. It becomes unnecessary.

  And in order to carry out synchronous control of the independent drive source, each drive source is made to hold | maintain mechanical, electromagnetic, or optical origin information. This enables synchronous control that ensures delivery of the paper sheet with reference to the origin.

  In the sheet-fed printing machine according to the next invention, in the sheet-fed printing machine, the second drive source holds a reference point in one-cycle operation of the separator as the origin, and the third drive source A reference point in one cycle operation of the feed mechanism is held as the origin.

  In the sheet-fed printing machine according to the next invention, in the sheet-fed printing machine, the reference point for the one-cycle operation of the separator is that the separator performs an operation of opening the paper sheet, and the one-cycle operation of the feed mechanism is performed. The reference point is a point where the paper sheet gripping means on the feeder belt provided in the feed mechanism performs an operation of gripping the paper sheet.

  If the origin is set as described above, the second drive source and the third drive source are moved to the origin, respectively, so that the separator and the feeder belt (catch roller) correspond to each other, that is, the separator is paper. At the position where the sheet releasing operation is performed, the paper sheet gripping means on the feeder belt moves to the position where the paper sheet is gripped, and it becomes clear at a glance whether the paper sheet delivery timing is appropriate. Thereby, the maintenance work becomes extremely easy.

  The sheet-fed printing press according to the next invention is the sheet-fed printing machine, wherein each rotation of the separator and the feed mechanism is rotated once for each cycle, and mechanically, electromagnetically, or optically. A gear having the origin of the drive source and the third drive source and origin acquisition means for acquiring the origin held by the gear are provided.

  If the gear for driving the separator and the feed mechanism has a physical origin, it can be referred to as a constant origin position without shifting. Also, when the origin is reacquired due to a battery voltage drop or the like, it can always be referred to as a constant origin position.

  In the sheet-fed printing machine according to the next invention, in the sheet-fed printing machine, the origin acquisition means rotates the second drive source and the third drive source at least once when a trigger signal is input. It has a drive means to make it.

  Thereby, the origin setting and the origin returning operation can be automatically performed, and the operation is greatly facilitated. The trigger signal may be a hardware operation by an operator or a software.

  According to the sheet-fed printing machine according to the present invention, since the separator and the feed mechanism have independent driving sources, the chain, the gear, and the driving force for transmitting the driving force from the printing unit to the separator and the feeder belt are provided. Many mechanical parts such as a clutch for turning on / off are not required. For this reason, anxiety factors such as chain elongation and chain breakage are eliminated.

  Moreover, since the drive sources of the separator and the feed mechanism each have an origin, each can be reliably synchronized with the origin as a reference. Further, the manual origin adjustment work by manual work is not necessary, and if the origin position is set to an appropriate position of the separator and the feeder belt, the origin setting work and the origin return work are facilitated. In addition, when the voltage of the battery for holding the origin is lowered, the origin can be reliably acquired again. Furthermore, it is easy to automatically return to the origin.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. The constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art.

  FIG. 1 is a schematic view showing an example of a sheet-fed printing machine according to the present invention. A sheet-fed printing machine according to the present invention includes a second drive source (separator drive source) 7 for driving a separator 3 of a sheet feeding device 2 provided in a sheet feeding unit of the sheet-fed printing machine, a feeder board, and the like. A third driving source (sheet feeding driving source) 15 for driving the feeder belt 16 incorporated in the sheet feeding mechanism and a first driving source (main for printing unit) for driving the printing unit 27 for the first color. Drive source) 20. That is, each of the separator 3 and the feeder belt 16 has the drive sources 7 and 15 that are independent from the first drive source 20 of the printing unit 27 that is the first color.

Then, the second drive source 7 that drives the separator 3, the third drive source 15 that drives the feeder belt 16, and the first drive source 20 that drives the printing unit 27 that is the first color are integrated. There is also provided an operation unit 24 for giving a command for controlling the control unit 25, the second drive source 7, the third drive source 15, and the first drive source 20 to the control unit. In addition, when the control unit 25 is operated, it is convenient to operate the display unit 26 that displays the state of each drive source on the monitor as much as possible.
Furthermore, in the present embodiment, feedback elements 8, 21, and 28 such as a rotary encoder are provided in the second drive source 7, the third drive source 15, and the first drive source 20 in order to increase the control accuracy. Provided. The encoder 21 does not need to be installed in the vicinity of the motor 20, but is preferably attached to a shaft end that makes one rotation for one rotation of the plate cylinder (single cylinder).

  As a basic apparatus configuration in this embodiment, the separator 3 employs a known configuration in which the stacked paper sheets 6 are sucked one by one by the gripping portions 4 and 5 and fed forward. Further, the feeder belt 16 having a gripping roller that is operated by a cam employs a known configuration in which a sheet fed forward by the separator 3 is fed forward until it hits a front pad 22 that is a partition. Here, the feeder belt 16 is rotatably supported by paper feed rollers 11, 19, 18, and 17, and the paper feed roller 11 is connected to a third drive source 15, a gear 14, and a non-circular gear 12a. , 12b, 13 and the opening and closing cam gear 9 and the belt are synchronized with the belt.

  In the sheet printing machine having the configuration and the control mechanism described above, the separator 3 and the feeder belt 16 are independently driven, so that the chain and sprocket for transmitting the driving force from the motor as the first driving source 20 Many mechanical parts such as gears (including sprockets) and clutches for turning on / off the driving force are no longer necessary, and there are no anxiety factors such as chain elongation and chain breakage. As a result, the reliability is improved and the cost is reduced.

  FIG. 2 is a conceptual block diagram illustrating a more specific configuration of the control unit and the drive source. The configuration shown here is roughly divided into a main control device 31, a second drive source (separator drive) peripheral device 32, and a third drive source (feed roller drive) peripheral device 33. The second peripheral device for driving source 32 includes a servo amplifier 35, a motor 36 with an encoder 39, and an origin confirmation timing sensor 34. An internal battery 37 is built in the servo amplifier. Further, control boards 38 are often mounted on recent servo motors 36.

  Similarly to the second drive source motor peripheral device 32, the third drive source peripheral device 33 includes a servo amplifier 41, a motor 42 with an encoder 45, and an origin confirmation timing sensor 40. Similarly, the internal battery 43 is built in the servo amplifier, and the control board 44 is mounted on the motor 42.

  The main control device 31 is electrically connected to the second drive source peripheral device 32 and the third drive source peripheral device 33 via a servo controller 47 capable of bidirectional communication. The servo controller 47 is also used as a synchronous encoder 46 for synchronizing with the encoders of the printing unit 27, that is, the first drive source 20, the second drive source 7, and the third drive source 15. Connected. The main control device 31 is also connected to origin confirmation timing sensors 34 and 40. Further, the main control device 31 is also connected to the display unit 26.

The second drive source 7 and the third drive source 15 each have a predetermined origin serving as a reference for control, and are controlled based on each origin. Specifically, the second drive source 7 holds a reference point (separator cycle confirmation reference point) in one cycle operation of the separator 3 as an origin for separator control. Further, the third drive source 15 holds a reference point (feeder cycle check reference point) in one cycle operation of the feeder belt 16 as an origin for feeder control.
More specifically, the reference point for the one-cycle operation of the separator 3 is a point at which the separator 3 performs an operation at the moment when the paper sheet is released. The reference point for the one-cycle operation of the feeder belt 16 is a point at which the holding roller (sheet gripping means) on the feeder belt 16 performs the operation at the moment when the paper sheet is gripped.

  The gear that drives the separator 3 is provided with a gear that rotates once for one cycle operation of the separator 3, that is, the operation of sucking one sheet of paper, transporting it forward, returning to the original position after opening. . A mechanical dog (projection body) is provided at a position corresponding to the separator cycle confirmation reference point in the vicinity of the outer periphery of the gear, and the passage of the dog is read by an origin confirmation timing sensor (origin acquisition means) 34 such as a proximity sensor. The position is set as the origin of the encoder 39. Instead of a mechanical dog, a magnetic combination such as a magnet and a field sensor, or an optical combination such as a light source and a slit and a light receiving sensor may be used. When manufacturing the sheet-fed printing machine, assembly is performed such that the origin confirmation timing sensor 34 is turned on at the origin position of the separator 3.

  Similarly, the gear that drives the feeder belt 16 has a one-cycle operation of the feeder belt 16, that is, the holding roller of the feeder belt 16 grips the sheet and conveys it to the front, and the sheet already in the front moves to the printing unit. A gear that rotates once for the operation of feeding is provided. A mechanical dog (projection body) is provided at a position corresponding to the feeder cycle confirmation reference point near the outer periphery of the gear, and the passage of the dog is read by an origin confirmation timing sensor (origin acquisition means) 40 such as a proximity sensor. The position is set as the origin of the encoder 45. In this case as well, a mechanical dog as well as a magnetic combination of a magnet and a field sensor, or an optical combination of a light source, a slit, and a light receiving sensor may be used. At the time of manufacturing the sheet-fed printing machine, assembly is performed so that the origin confirmation timing sensor 40 is turned on at the origin position of the feeder belt 16.

  When the origin confirmation timing sensors 34 and 40 are turned on, the main controller 31 issues an origin storage command to the servo controller 47, and the values detected by the encoders 39 and 45 are stored in the memories built in the servo amplifiers 35 and 41 as separators. Origin data and feeder mechanism origin data. The internal batteries 37 and 43 of the servo amplifiers 35 and 41 are used to hold information stored in the memory such as the origin data.

  When a trigger signal is input to the main control device 31, the second drive source 7 and the third drive source 15 are rotated at least once at a low speed by a software servo program (driving means), as described above. An origin acquisition means for detecting and acquiring the origin mechanically, electromagnetically, or optically using a gear having a dog is provided. As a result, for example, when the operator performs a trigger operation such as pressing the automatic storage start button for the origin, the separator 3 and the feeder belt 16 automatically rotate at a low speed, and the origin confirmation timing sensors 34 and 40 are turned on. In this case, the main control device 31 can store the origin data of the encoder values 39 and 45 in the servo amplifiers 35 and 41. The trigger signal may be software or hardware.

  Further, in the control mechanism in this embodiment, when the power of the sheet-fed printing machine is turned on, the main control device 31 sends a voltage drop alarm signal of the internal batteries 37 and 43 from the servo amplifiers 35 and 41 via the servo controller 47. A receiving alarm mechanism is provided. When the alarm signal is received, the main control device 31 determines that the origin storage data of the encoders 39 and 45 has disappeared, and displays a voltage drop alarm for the internal batteries 37 and 43 of the servo amplifiers 35 and 41 on the display unit 26. In addition to performing display control for display, a confirmation button for starting automatic storage of the origin is displayed as notification control for the operator, and control for forming an input unit for receiving an execution command for storage start processing on the display unit 26 is performed. Thus, the process of automatically storing the origin can be started as described above only by pressing the confirmation button by the operator. The display control on the display unit and the automatic origin storage control associated therewith are executed based on a program stored in the main control device 31.

  FIGS. 3-1 to 3-9 are external views showing image images displayed on the display unit. Here, a case will be described in which the origin of the second drive source 7 is set by manual operation without using the dog as described above. First, the separator 3 at an arbitrary position is moved to a position that is the moment when the paper sheet is released by an existing remote control operation or manual operation (in FIG. 3-1, the second drive source phase angle 248.7 at that time). Degree). If the servo motor shaft does not rotate more than once, the separator 3 is moved to the above position after being rotated to some extent. When the sheet is moved to the sheet opening position, the origin capturing screen is displayed, and the position at that time is set to 0 degree, that is, the origin (see reference numeral 52 in FIG. 3-2 and reference numeral 53 in FIG. 3-3).

  The origin of the third drive source 15 is set by moving the feeder belt 16 to a position where the gap between the roller driving the feeder belt 16 and the roller is minimal, for example, 0.3 mm. After that, the origin is set as in the case of the separator 7 (see reference numeral 54 in FIG. 3-4, reference numeral 55 in FIG. 3-5, reference numeral 56 in FIG. 3-6).

  During synchronous control of the separator 3, the feeder belt 16, and the printing unit 27, control is performed with the synchronous encoder 46 as a reference in consideration of differences in inertia and gain of each drive source. For this reason, the synchronous encoder 46 also performs control for setting the origin. More specifically, the machine phase at which the paper feeding from the front application portion of the paper sheet, which is the paper feeding start phase, starts at a point of 0 degrees with a power board that can determine the rotation angle provided in the intermediate cylinder on the printing unit side. The points are adjusted and set as the origin (see reference numeral 57 in FIG. 3-7 and reference numeral 58 in FIG. 3-8).

  Also, as shown in FIG. 3-9, when the power of the sheet-fed printing machine is turned on, the main control device 31 sends an existing voltage drop alarm signal from the servo amplifiers 35 and 41 to the internal batteries 37 and 43. When received via the servo controller 47, it is determined that the origin storage data of the encoders 39 and 45 has disappeared, and the voltage drop alarm of the internal batteries 37 and 43 of the servo amplifiers 35 and 41 is displayed on the display unit 26, and the origin is automatically Also displays a confirmation button to start storage. It should be noted that if the display unit 26 can select buttons on the screen, the display unit also serves as an operation unit.

  FIG. 4 is a schematic diagram illustrating a hardware configuration of the operation unit and the control unit (main control device). The hardware configuration of the operation unit and the control unit is mainly a processor 60 such as a CPU or DSP (Digital Signal Processor) which is a CISC (Complex Instruction Set Computer) or RISC (Reduced Instruction Set Computer), a ROM 62, a RAM 63, and an input / output interface. In general, the (I / O) 65 is connected by a bus 61. The bus 61 is preferably provided with a recording bus such as a hard disk 64, MO, CD-R / RW drive, and flexible disk drive, and a serial bus that allows connection of a recording medium such as a nonvolatile memory.

  Processor execution programs such as an origin setting program and an origin return program are stored in the ROM 62 in advance. The ROM 62 also stores a communication program with the input / output interface 65 and a program for input / output. The input / output interface 65 is connected to a device connected thereto, specifically, the separator 3, the second drive source 7, the rotary encoder 8, the third drive source 15, the first drive source 20, and the rotary encoder. 21, an operation unit 24, a display unit 26, and the like are connected (A / D converters and D / A converters are provided depending on devices). Here, the description has been made assuming digital processing by software, but may be realized by analog processing by hardware.

When the origin setting mode and the origin return mode are selected on the operation unit 24, the program stored in the storage unit constructed by the ROM 62, the RAM 63, the HDD 64, etc. is read, and the origin information is converted to the origin via the input / output interface 65. Reading from the timing sensors 34 and 40 for confirmation, giving a command to the motor as a drive source, and writing origin information in the servo amplifiers 35 and 41.
The configuration of the control unit 25 is not limited to the configuration of FIG. 4 and the control sequence described above. For example, a motion controller in which servo drivers are connected in series and a sequencer that transmits a status signal of the printing press to the motion controller are provided. It is good also as a structure which is set as the control part provided and controls a servo driver and a motor via this motion controller.

  As described above, according to the sheet printing machine according to the present invention, an independent driving source is provided for the separator 7 and the feeder belt 16, and the origin setting which is indispensable when the synchronous control is performed can be performed by a simple operation of the operator. . Further, even when the internal battery for holding the origin information is low, the origin information can be reacquired with a simple operation.

  In addition, because the origin can be appropriately acquired, the control unit 25 can independently control the drive sources 7, 15, and 20 and can perform synchronous control. In addition, fine adjustment is possible for each drive source. For example, if the timing of holding the sheet fed by the separator 3 of the feeder belt holding roller (nipping means, not shown) is slightly delayed due to the influence of paper quality, the rotation of the gear 9 that controls the opening and closing timing of the holding roller In order to speed up the operation slightly, the operation unit is operated by an amount shifted late. As a result, a command by an electrical signal is sent from the control unit 25 to the third drive source 15, the rotation angle of the third drive source 15 advances, and thereafter, the second drive source 7 is synchronously controlled. These controls can be performed during operation. Therefore, when the transfer of the paper sheet between the separator 3 and the feeder belt 16 is not successful, the third drive source 15 can be adjusted and controlled while visually confirming the state. In addition, you may make it control with respect to a 2nd drive source by operation of an operation part.

  Further, before the paper sheet conveyed by the feeder belt 16 is printed by the printing unit, the position of the front edge of the paper sheet is aligned by the front pad 22, and the side edge portion with respect to the paper sheet conveying direction is further aligned. They are aligned by a sheet side edge adjusting device 23 called a horizontal needle. Here, if the interval between the timing at which the paper sheet reaches the front pad 22 and the timing at which the paper sheet is sent to the printing unit 27 is short, the front edge and the side edge of the paper sheet cannot be sufficiently aligned, and the paper sheet is transferred. The printed material may be misaligned.

  In the present invention, since the first drive source 20 and the third drive source 15 are controlled independently, the timing at which the paper sheet reaches the front cover is controlled by controlling the third drive source 15. Can be controlled and changed. In addition, the timing at which the paper sheet is sent to the printing unit is changed by controlling the first drive source 20, thereby changing the timing at which the front contact 22 linked to the first drive source 20 rises. Can be made. The timing deviation may be determined based on the amount of scale, or may be grasped from the rotation angle of the feeder belt 16 or the rotation shaft that drives the front contact.

  Specifically, when the paper is delayed due to slippage of the paper sheet, and the time interval for aligning the sheet position with the paper sheet hitting the front pad 22 is shortened, the first drive source 20 or the third drive source 15 is controlled. Accelerate the arrival of paper sheets. As a result, a sufficient time can be secured for aligning the front and side edges of the paper sheet. The amount of timing deviation is more accurately obtained by strictly obtaining the difference between the pulse of the encoder attached to the first drive source 20 and the pulse of the encoder 45 attached to the third drive source. Control can be realized. However, when control accuracy and speediness are not required, a configuration for determining which drive source should be controlled by receiving a so-called scale amount based on an operator's experience or the like through known input means. Also good.

  The means for confirming that the timing is shifted (slow or early timing) is, for example, that the operator monitors whether the paper feeding is stopped due to incorrect paper feeding or the paper is largely twisted at the front contact portion. In addition, there is a means for sensing that the paper has not arrived at a necessary timing with a register detector or the like in the front part. It should be noted that the timing adjustment is preferably possible during operation. This is because even if the timing is shifted due to factors such as the type of sheet, the printing can be adjusted without interruption. That is, it saves time to interrupt and adjust timing.

  As described above, the sheet-fed printing machine according to the present invention is useful for adjustment, maintenance, and synchronous control of the paper feeding unit in a broad sense.

It is a schematic diagram which shows the example of the sheet-fed printing machine which concerns on this invention. It is a conceptual block diagram which shows the more specific structure of a control part and a drive source. It is an external view which shows the image image displayed on a display part. It is an external view which shows the image image displayed on a display part. It is an external view which shows the image image displayed on a display part. It is an external view which shows the image image displayed on a display part. It is an external view which shows the image image displayed on a display part. It is an external view which shows the image image displayed on a display part. It is an external view which shows the image image displayed on a display part. It is an external view which shows the image image displayed on a display part. It is an external view which shows the image image displayed on a display part. It is a schematic diagram which shows the hardware constitutions of an operation part and a control part. It is an external view which shows the structural example of the conventional conventional sheet-fed printing machine. It is sectional drawing which shows the paper feed part of a broad sense.

Explanation of symbols

2 Feeder 3, 90 Separator 4, 91 Gripper 7 Second drive source 8, 21 Rotary encoder 9 Open / close cam gear 11, 19, 18, 17 Rollers 12a, 12b, 13, 99, 100 Non-circular gear 14, 95, 97, 98, 101 Gear 15 Third drive source 16, 105 Feeder belt 20 First drive source 23 Sheet side edge adjusting device 24 Operation unit 41 Servo amplifier 25 Control unit 26 Display unit 27, 109 Printing unit 31 Main Control device 32 Second drive source motor peripheral device 33 Third drive source motor peripheral device 34, 40 Origin confirmation timing sensor 35, 41 Servo amplifier 36, 42 Motor 37, 43 Internal battery 38, 44 Substrate 39, 45 Encoder 46 Synchronous encoder 47 Servo controller 60 Processor 61 Bus 64 Hard disk 65 I / O interface 71 Sheet-fed printing machine 72 Narrowly defined sheet feeding unit 73a Printing unit 74 Paper discharging unit 75 Broadly defined sheet feeding unit 86 Cam 87 Universal joint 93 Sheet sheet 94, 96 Pulley 107, 112 Sprocket 107 Drive source 110 chain

Claims (5)

In a sheet-fed printing machine in which a separator of a paper feed unit and a feed mechanism that conveys a paper sheet to a printing unit are driven synchronously,
Each of the separator and the feed mechanism includes a second drive source and a third drive source that are independent from the first drive source that drives the printing unit, and the second drive source and the feed mechanism A sheet-fed printing machine, wherein the third drive source has a predetermined origin as a reference for control and is controlled based on the origin.   The second drive source has a reference point in one cycle operation of the separator as the origin, and the third drive source has a reference point in one cycle operation of the feed mechanism as the origin. The sheet-fed printing machine according to claim 1, wherein   The reference point for the one-cycle operation of the separator is a point at which the separator performs an operation of opening the paper sheet, and the reference point for the one-cycle operation of the feed mechanism is a paper sheet gripping means on a feeder belt provided in the feed mechanism. The sheet-fed printing machine according to claim 1 or 2, characterized in that is an operation for gripping a paper sheet. A gear that rotates once for one cycle operation of the separator and the feed mechanism and mechanically, electromagnetically, or optically holds the origin of the second drive source and the third drive source. ,
Origin obtaining means for obtaining the origin held by the gear;
The sheet-fed printing machine according to any one of claims 1 to 3, further comprising:   5. The sheet according to claim 4, wherein the origin obtaining unit includes a driving unit that rotates the second driving source or the third driving source at least once when a trigger signal is input. Leaf printing machine.

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