JPS6015473B2 - Printing machine web transfer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a web transfer device for a printing machine configured to transfer a web by a transfer roller rotationally driven by a pulse motor.

In the web transfer device of a printing machine, a large amount of force is required for transfer due to the large physical load caused by the supply reel, transfer path, etc., and furthermore, rapid web transfer is required. Therefore, it is necessary to supply a large amount of current to drive the rotation of the pulse motor.

Therefore, in general, the fin source required for transfer is not supplied except during transfer to prevent overheating and damage to the pulse motor and to save on overhead power.
However, according to the above-mentioned subordinate structure, the web cannot be firmly held because the pulse motor has no static torque.

Therefore, when a force is applied to the web in the plane direction when cutting the web, the web moves and the printing position etc. shifts, resulting in disturbances in the printed character spacing and line spacing corners. Ta. Particularly, when the printed information is optically read information such as OCR characters, errors of more than a certain level in the spacing between characters and between lines can become irrefutable.

The present invention has been made in view of the above-mentioned circumstances, and when force is applied in the surface direction of the web due to cutting or the like, the web is cut by supplying a large amount of current to the pulse motor to generate a large static torque. It is an object of the present invention to provide a printing machine web transport device configured to be firmly held.

Embodiments of the present invention will be described in detail below with reference to the drawings.

Figure 1 shows the overall structure of the printing machine, with reference number 1.
is a continuous tag illustrated as a web, and is made of relatively thick paper.

The false feed reel 2 wound with this lotus-like tagu is rotatably supported by a loading shaft 4 attached to the main body 3 in a detachable manner. The tag 1 supplied from the supply V supply reel 2 is guided to a transfer passage 7 and is constantly tensioned by a tension roller 6 supported at one end of a tension lever 5. The transfer roller 1 guided to the transfer path 7 is sandwiched between a pair of transfer rollers 8 and 9, which are a driving roller and a driven roller, and is appropriately transferred.

The driving transfer loaf 8 is rotatably supported by a roller support shaft 10 fixed to the main body 3, and is rotated as appropriate via gears 12 and 13 by a pulse motor 11 fixed to the main body 3. Ru. In addition, the transfer roller 9 for the sardine
is rotatably supported by a roller support shaft 14 at one end of the lever 15 . This lever 15 is rotatably attached to the main body 3 by a pivot 16, and is attached to a spring 17 so that the driven transfer roller 9 rotates in the direction in which the driven transfer roller 9 comes into pressure contact with the driving transfer roller 8 with the tag 1 in between. It is energized. The line printer type printing mechanism 20 is
The printing drum 21 that rotates constantly and the tag 1 are placed on the printing drum 21.
It has a plurality of printing hammers 22 that strike the tag 1, and a guide plate 23 that guides the tag 1, and prints a predetermined line on the tag 1 that is moved by a pair of transfer rollers 8 and 9. The printed continuous tag 1 is cut into predetermined lengths by a fixed blade 25 included in the cutting mechanism 24 and a drum-shaped rotary blade 26 having a blade 26a in the direction of the outer periphery.

The fixed blade 25 is fixed to the main body 3, and the rotary blade 26 is attached to a rotating shaft 27 that is pivotally supported on the main body 3, and is configured to rotate together with this rotating shaft 27. A rotating shaft 27 supporting the rotary blade 26 is connected to a DC motor 30 via gears 28 and 29, and is rotationally driven by this DC motor 3. Further, the rotating shaft 27 has an engaging portion 31 on a part of its outer periphery.
A disk-shaped rotation control member 31 having a diameter a is attached.

In the rotation control member 31, in a normal state, that is, in a stopped state of the rotary blade 26, the engaging portion 31a is connected to the positioning member 31.
The rotary blade 26 is held at an appropriate initial position by being sandwiched and engaged with the reverse rotation preventing member 33. The positioning member 32 is connected to the shaft 3 with respect to the support plate 34 erected on the main body 3.
5, and is constantly biased clockwise in FIG. 1 by a spring 36.

In the normal state, the positioning member 32 biased by the spring 36 comes into contact with a pin 37 fixed to the support plate 34 and stops, and in this state, the engaging portion 31a of the rotation control member 31 The elastic member 32a can be engaged with the elastic member 32a. Further, a plunger of a solenoid 38 attached to a support plate 34 is connected to the positioning member 32 .

By the operation of this solenoid 38, the positioning member 32
rotates counterclockwise in FIG. 1 against the biasing force of the spring 36, and the elastic member 32a portion
deviates from the rotation locus of the engaging portion 31a. In this state, a photoelectric detector S attached to the support plate 34 detects a part of the positioning section 32. Reversal prevention member 33
The spring 3 is such that one end is pivotally connected to the positioning member 32 and the other end engages with the engaging portion 31a of the rotation control section 31.
9 is biased clockwise in FIG.

The reverse rotation prevention section 33, which is biased by the spring 39, normally comes into contact with a part of the positioning member 32 and stops, and when the rotation control section 31 rotates once in the forward direction, that is, in the direction of arrow A. After being pressed by the engaging portion 31a and rotated in the counterclockwise direction, the rotation control member 31 returns to the state shown in FIG. 1 so as to prevent the rotation control member 31 from being reversed. M is a magnet fixed to the rotation control member 31, and this magnet M acts on three magnetic detectors S2, S3, and S4 attached to the main body 3 when the rotation control member 31 rotates. Specifically, when the rotary blade 26 and the rotation control member 31 are in the initial position as shown in FIG. 1, the detector S2 is engaged by the forward rotation (rotation in the direction of arrow A) of the rotation control member 31. Part 31
a passes through the elastic material 32a, and the detector S4
are arranged at positions where the magnets M are detected immediately before the tag 1 is cut. Reference numeral 40 denotes a driving delivery loaf pivotally attached to the main body 3, and connected to the rotating shaft 27 by a timing belt 41.

A driven delivery roller 42 supported by the main body 3 is pressed under the delivery roller 40 . The driving delivery roller 40 is connected to the rotating blade 26 by the rotating shaft 27.
However, until the continuous tag 1 is cut, it slips between the continuous tag 1 and the tag 1, and after cutting, the cut single-leaf tag 1 is transported into the stacker 43 together with the feed roller 42 for continuous feeding. The materials are sent out in such a way that they are layered one after another. Next, the control circuit of the printing machine will be explained based on FIGS. 2 and 3.

The signals output from the aforementioned detectors S, S2, S3, and S4 are waveform-shaped by waveform shaping circuits 50, 51, 52, and 53, respectively, and then input to the central processing unit 54.

In addition, each detector S,, S2, S3, S4 in FIG.
The signal corresponding to is shown after waveform shaping. A solenoid 38 that drives the DC motor 30 and positioning member 32 shown in FIG. 1 is connected to the central processing unit 54.

This solenoid 38 is energized based on a cutting start signal C generated within the central processing unit 54 by a program.
It is demagnetized based on the output signal of the detector S3. Then, the DC motor 30' starts based on the output signal of the detector S, which detects the positioning member 32, and stops based on the output signal of the detector S4. Furthermore, the central processing unit 54 controls a rotation control circuit 55 that controls the rotation of the pulse motor 11, and also controls a printing mechanism drive circuit 55 based on printing data.
6 is also controlled.

Based on the command signal from the central processing unit 54, the rotation control circuit 55 controls each of the transistors Tr3, Tr4, Tr5, and Tr6 that drive the pulse motor 11, and the printing mechanism drive circuit 56 controls each of the transistors shown in FIG. Printing hammer 2
Drive 2. The output signal from the waveform shaping circuit 51 that shapes the output signal of the detector S2 is inverted and input to one input terminal of the two-input OR gate circuit G, and the output signal from the flip-flop circuit 57 is input to the other input terminal. A signal is input. This flip-flop circuit 57 is set based on the output signal from the detector S, and is set based on the output signal from the detector S.
It is configured to be reset based on the output signal from 4. Therefore, the OR gate circuit G,
The cutting signal continues to be output from the start of rotation of the DC motor 30 shown in the figure until the signal is obtained from the detector S2, that is, while the rotary blade 31 and the delivery roller 40 are rotating to perform the cutting operation. In this way, the detectors S,,S2,
S3, S4, waveform shaping circuits 50, 51, 52, 53, flip-flop circuit 57, and OR gate circuit G constitute a disconnection detection circuit that detects a disconnection operation and outputs a disconnection signal. The disconnection signal output from the OR gate circuit ○ is input to the first input terminal of the three-input OR gate circuit G2, and the transfer signal f from the rotation control circuit 55 is input to the second input terminal of this OR gate circuit G2. Further, the printing signal P from the printing mechanism drive circuit 56 is inputted to each of the third input terminals.

The transfer signal f from the rotation control circuit 55 continues to be output while the pulse motor 11 is being driven, and the printing signal P from the printing mechanism drive circuit 56 is output when printing is performed by each printing hammer 22 shown in FIG. Output every time. Therefore, signals are output from the OR gate circuit G2 while the rotary blade 31 and the delivery roller 40 are rotating, while the tag 1 is being transferred, and when each print hammer 22 prints. Note that the transfer signal f and the print signal P are as follows:
It is also possible to configure the central processing unit 54 to output directly to the OR gate circuit G2. The signal from the OR gate circuit G2 that outputs the signal as described above is transmitted to the pulse motor 1.
The signal is inputted to a power supply control circuit 58 that controls the drive power supply of 1.

Specifically, the output terminal of the OR gate circuit C2 is connected to the base of the transistor T via a protective resistor R. Further, the emitter of this transistor Tr is grounded, and the collector is connected to a power source 59 via resistors R2 and R3 connected in series. The base of the transistor Tr2 is connected between the resistor 2 and the resistor R3, and the emitter of the transistor Tr2 in parentheses is connected to the power supply 59.
The collector is connected to the pulse motor 11 via resistors 4 and R5 connected in parallel. Furthermore, power supply 5
A resistor R6 is connected between 9 and the collector of the transistor Tr.
is connected. The transistor Tr and the transistor Tr2 are both turned off when no signal is output from the OR gate circuit ○2.

Therefore, the pulse motor 11 is supplied with a small current 1, which flows through the resistor R6 and is suitably distributed through the resistors R4 and R5. Further, when a signal is output from the OR gate circuit G2, the transistor Tr is turned on and a current 12 flows.
Transistor Tr2 is also turned on.

As a result, the pulse motor 11 has a transistor Tr.
A large amount of current 13 flowing through resistors R4 and R5 is distributed and supplied through resistors R4 and R5. Next, the operation of the printing machine as a whole and the operation of the web transport device will be explained.

A case will be described in which the printing machine operates in the order of cutting, transporting, and printing the tag I. First, before the cutting operation starts, there is no output signal from the OR gate circuit G2, so the transistors Tr, Tr2 are in an off state, and a small current 1 flows through the resistor R6.

Due to this current 1, the pulse motor 11 holds the transfer roller 8 with a relatively weak static torque that can withstand the tension of the tag caused by the tension lever 5 shown in FIG. Therefore, the solenoid 38 is activated by the cutting start signal C in the central processing unit 54, and the detector S detects the positioning member 32 shown in FIG. And this detector S,
The DC motor 30 is started based on the output signal from the rotary blade 31 and the delivery roller 40 are rotated. While the rotary blade 31 and the delivery roller 40 are rotating, the OR gate circuit ○2 outputs a signal as described above, turning on the transistors Tr, Tr2, and a large amount of current 13 flows through the transistor Tr2. As a result, the static torque of the pulse motor 11 increases, and the driving transfer roller 8 shown in FIG.
The tag 1 is held with a tensile force of 4 and a strong holding force that is not affected by the impact caused by cutting. Then, when the rotary blade 31 and the delivery roller 40 stop rotating and the output signal from the OR gate circuit G2 disappears, the transistors Tr, Tr2 are turned off, and the current 1 flows through the resistor R6 again. Further, the rotation control circuit 55 controls the transistors Tr3, Tr4, Tr.
5. When the Tr 6 is appropriately driven and the pulse motor 11 rotates, the drive transfer roller 8 rotates, and the tag 1 is transferred together with the driven transfer roller 9.

During this transfer, a signal is outputted from the OR gate circuit ○2, and a large amount of current is also supplied to the pulse motor 11, which flows through the transistors T and the like, as in the above-described cutting and sending of the tag 1. As a result, the pulse motor 11 operates quickly and rotates with sufficient force to transport the tag 1. Furthermore, when printing is performed on the tag 1, a signal is output from the OR gate circuit G2 every time each printing hammer 22 prints, and each time this signal is output, the transistors Tr, Tr2 are turned on.

As a result, each time printing is performed by each printing hammer 22, the static torque of the pulse motor 11 increases in the same way as when cutting and sending out the printing plate 1 described above, and the driving transfer roller 8
The tag 1 is held with a strong holding force together with the driven transfer roller 9. Therefore, the tag will not be displaced by the impact of the printing hammer 22. As described above, the present invention supplies sufficient current to the pulse mower to provide sufficient rotational torque to transport the web when transporting the web, and sufficient static torque to hold the web so that it does not move when cutting the web. is configured to do so.

Therefore, the web is transported quickly and is properly held firmly so that it does not move during cutting, so there is no misalignment of the printing position, and there is no risk of damage to the pulse motor due to overheating. Nor.

[Brief explanation of the drawing]

Each drawing shows an embodiment of the present invention. Figure 1 is a side view showing the overall structure of the printing machine, Figure 2 is a diagram showing the control circuit of the printing machine, and Figure 3 is the control shown in Figure 2. 5 is a timing chart showing the operating state of the circuit. In the drawings, 1... Yugu (web), 11...
...Pulse motor, 8, 9...Transfer roller, 5
5... Rotation control circuit, 58... Power control circuit. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. In a web transfer device of a printing machine configured to transfer a web by a transfer roller rotationally driven by a pulse motor, a rotation control circuit for controlling the rotation of the pulse motor and a rotation control circuit for detecting a web cutting operation are provided. a cutting detection circuit that outputs a cutting signal when the pulse motor is rotating; a gate circuit that inputs a transfer signal supplied while the pulse motor is rotating and the cutting signal and outputs a signal when at least one of the signals is input; and a power supply control circuit that supplies a large amount of current to the pulse motor when a signal is output from the circuit, and supplies a small amount of current to the pulse motor when no signal is output. Machine's web transfer device.