JPS6297871A - Printer - Google Patents

Abstract

PURPOSE:To prevent both an automatic sheet feeder and a form tractor from being simultaneously driven and thereby prevent a paper from being jammed, by providing a switching lever for alternatively switching the drivings of the automatic sheet feeder and the form tractor. CONSTITUTION:When a switching lever 34 is turned to the side of an automatic sheet feeder, an OFF signal is outputted from a controlling circuit 43 to an electromagnetic clutch, whereby a platen gear 13 and a tractor gear 32 are disconnected from each other. In addition, a driving signal is outputted from the controlling circuit 43 for each driving timing for a fan motor 8, whereby a slip paper 4 contained in a cassette 3 is fed out. When the lever 34 is turned to the side of a form tractor, the output of the driving signal from the controlling circuit 43 to the fan motor 8 is stopped, and an ON signal is outputted to the electromagnetic clutch for a connecting gear 33. With the clutch engaged, the rotation of the platen gear 13 is transmitted to the tractor gear 32, and a continuous paper 27 is automatically fed by a tractor part 31. Accordingly, by operating the switching lever 34, the slip paper 4 and the continuous paper 27 can be alternatively selected, and paper jam can be prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a printing device, and particularly to a printing device that can be equipped with an auto sheet feeder and a form tractor at the same time.

(Prior Art) A printing device is equipped with an automatic paper feeder in order to quickly and easily load recording paper. Automatic sheet feeding devices include an automatic sheet feeder that automatically feeds single sheets, and a form tractor that automatically feeds continuous sheets.

Conventionally, a printing device can be equipped with either an auto sheet feeder or a form tractor as an automatic sheet feeding device. That is, when attaching an auto sheet feeder, the form tractor must be removed from the printing device and then the auto sheet feeder is attached; conversely, when attaching the form tractor, the auto sheet feeder must be removed.

Therefore, in recent years, in order to improve the operability of printing devices, printing devices that can be equipped with both an auto sheet feeder and a form tractor have appeared.

In this printing device that can be installed simultaneously, the auto sheet feeder has a motor (fan motor) dedicated to feeding paper, and this fan motor drives a kick roller to feed paper from a stacker or cassette that stores single sheets. The sheets are fed one by one to the platen of the printing device, and the form tractor has a drive gear fixed to the form tractor and a platen gear fixed to the platen connected via an electromagnetic clutch. rotation is transmitted to the drive gear.

Therefore, when printing on single sheets, turn off the electromagnetic clutch of the form tractor with a switch.
The fan motor of the auto sheet feeder is driven by a command from a host, such as a word processor, or by a switch, to feed a single sheet of paper to a platen. On the other hand, when printing on continuous paper, the power to the fan motor is turned off by a command from the host or a switch, and the electromagnetic clutch is turned on by a switch to connect the platen gear and the drive gear, and the drive force of the platen gear is used to drive the form tractor. to feed continuous paper to the platen.

However, in such conventional printing devices,
Since the switch to turn off the electromagnetic clutch of the form tractor and the switch or command to control the operation of the auto sheet feeder were provided separately, the auto sheet feeder may be driven with the electromagnetic clutch turned on. In this case, if paper is set on the form tractor, single sheets and continuous sheets are fed to the platen at the same time, causing a paper jam.

(Purpose of the Invention) Therefore, the present invention provides a switching lever that selectively switches between driving the auto sheet feeder and the form tractor, thereby preventing the auto sheet feeder and the form tractor from being driven at the same time. The purpose is to prevent this from occurring.

(Structure of the Invention) In order to achieve the above object, the present invention provides an auto sheet feeder in a printing device that is simultaneously equipped with an auto sheet feeder that automatically feeds single sheets and a form tractor that automatically feeds continuous sheets. The invention is characterized in that a switching lever is provided for selectively switching between the drive of the form tractor and the drive of the form tractor.

Hereinafter, the present invention will be specifically explained based on examples.

1 to 3 are diagrams showing an embodiment of the printing device of the present invention.

In FIG. 1, 1 is a printer, and an auto sheet feeder 2 is attached below the printer 1 to automatically feed cut sheets. A cassette 3 can be attached to the auto sheet feeder 2, and a second
As shown in the figure, single sheets 4 are stored. A kick roller 5 is disposed within the auto sheet feeder 2, and the kick roller 5 feeds the sheets 4 in the cassette 3 one by one. The kick roller 5 is rotatably supported by a shaft 5a, and is urged by a spring (not shown) through the shaft 5a to abut against the cut sheet 4 in the cassette 3, and a pulley 6 is attached to the shaft 5a. It is being

The pulley 6 connects to the fan IJ of the fan motor 8 via the belt 7.
The rotation of the fan motor 8 is transmitted to the kick roller 5 via the pulley 9, the belt 7, and the boot IJ 5. Therefore, when the kick roller 5 is rotationally driven by the fan motor 8, it feeds out the cut sheets 4 from the cassette 3 one by one. The cut sheet 4 sent out from the cassette 3 is guided by the guide plate 10 and reaches feed rollers lla and llb, and then feed roller lla and llb.
a, llb into the printer l.

A platen 12 is rotatably disposed within the printer 1 via its shaft 12a, and a platen gear 13 is fixed to the shaft 12a. Further, a guide shaft 14 and a support shaft 15 are arranged in the printer 1 in parallel with the platen 12, and the guide shaft 14 and the support shaft 15 slidably support a carriage 16. The carriage 16 is equipped with a printing mechanism 17, which includes, for example, a hammer, a daisy wheel, a select motor, a hammer solenoid, etc., and prints on paper set on the platen 12.

The cut sheet 4 fed into the printer 1 passes through the guide plate 18.
19 and reaches the platen 12, and is guided by rollers 20.
21 and is wound closely around the platen 12.

The printing mechanism 1 is attached to the cut sheet 4 placed on the platen 12.
7, and the cut sheet 4 is further printed by the guide plate 2.
2 and reach the delivery rollers 23, 24.

The cut sheet 4 that has been printed is sent to the feed rollers 23 and 24.
The paper is discharged to the paper discharge device 25.

In addition to the paper ejecting device 25, a form tractor 26 is installed at the top of the printer l, and the form tractor 26 automatically feeds continuous paper 27. The form tractor 26 has guide rails 29 supported by both side plates 28.
30 and a pair of tractor sections 31 movably attached to guide rails 29 and 30, and when the guide rails 29 rotate, the tractor main body 31a of the tractor section 31 rotates to move the continuous paper 27. send. A tractor gear 32 is attached to the guide rail 29, and the tractor gear 32 can be connected to the platen gear 13 via a connection gear 33. The connecting gear 33 has an electromagnetic clutch built therein, and the platen gear 13 and the tractor gear 32 are connected and disconnected by ON/OFF of the electromagnetic clutch.

As shown in FIG. 1, the printer 1 has a switching lever 34.
is attached, and the operation of the auto sheet feeder 2 and the form tractor 26 can be selectively switched by operating the switching lever 34.

That is, as shown in FIG. 3, the switching lever 34 is rotatably supported by a shaft 35.
A swing pin 36 is attached to the tip.

The swing pin 36 locks one end of the spring 37,
The other end of the spring 37 is locked to a fixing pin 38 attached to the printer 1. Two microswitches 39 and 40 are arranged near the tip of the switching lever 34, and the microswitches 39 and 40 are arranged so that leaf sedge rings 39a and 40a face each other. When the switching lever 34 is rotated toward the ASF side (in the direction of arrow A in FIG. 3), the tip of the switching lever 34 pushes the leaf spring 39a of the microswitch 39, turning the microswitch 39 ON. When the switching lever 34 is rotated toward the F/T side (in the direction of arrow B in FIG. 3), the switching lever 3
The tip of 4 is a leaf spring 4 with a micro switch 40.
Press 0a to turn on the microswitch 40. The spring 37 acts to maintain the rotational position when the switching lever 34 is rotated, and reference numerals 41 and 42 in FIG. 3 are stopper pins.

The microswitches 39 and 40 are part of the control circuit 4 shown in FIG.
The control circuit 43 controls the operation of the electromagnetic clutch and fan motor 8 by outputting signals to the electromagnetic clutch of the coupling gear 33 and the fan motor 8 based on the signals from the microswitches 39 and 40. That is, when an ON signal is input from the microswitch 39 and an OFF signal is input from the microswitch 40, the control circuit 43 outputs an OFF signal to the electromagnetic clutch to turn the electromagnetic clutch OFF, thereby disconnecting the platen gear 13 and the tractor gear 32. At the same time, the fan motor 8 is driven by outputting a drive signal at each drive timing of the fan motor 8. Further, the control circuit 43 includes the microswitch 3
When an OFF signal is input from the micro switch 9 and an ON signal is input from the micro switch 40, the output of the drive signal to the fan motor 8 is stopped to stop the drive of the fan motor 8, and at the same time, an ON signal is output to the electromagnetic clutch. The electromagnetic clutch is turned on, the platen gear 13 and the tractor gear 32 are connected, and the rotation of the platen gear 13 is transmitted to the tractor gear 32.

Next, the effect will be explained.

When using the auto sheet feeder 2, the switching lever 34 is rotated to the ASF side. At this time, the micro switch 39 is turned on, the micro switch 40 is turned off, and the control circuit 43 outputs an OFF signal to the electric 6n clutch, thereby disconnecting the platen gear 13 and the tractor gear 32. Then, from the control circuit 43, the fan motor 8
A drive signal is output at every drive timing of the fan motor 8, and the fan motor 8 is driven at every predetermined drive timing. When the fan motor 8 is driven, the kick roller 5 rotates via the belt 7, and the cut sheet 4 in the cassette 3 is sent out. The cut sheet 4 sent out from the cassette 3 is guided by guide plates 10, 18, and 19, and is fed by feed rollers lla and llb to the platen 1.
Set to 2. The printing mechanism 17 prints on the cut paper 4 set on the platen 12, and when the printing is completed, the feed rollers 23 and 24 move the paper to the paper ejection device 25.
is discharged.

On the other hand, when using the form tractor 6, the switching lever 34 is rotated to the F/T side, and the continuous paper 27
is set at the lower part of the tractor section 31 from the rear of the printer 1, and then wound around the platen 12.
Set it on the top of the

When the switching lever 34 is rotated to the F/T side, the microswitch 39 is turned OFF and the microswitch 40 is turned ON, and the output of the drive signal from the control circuit 43 to the fan motor 8 is stopped, and the connection gear 33 is turned off. An ON signal is output to the electromagnetic clutch. When the electromagnetic clutch is turned on, the rotation of the platen gear 13 is transmitted to the tractor gear 32 via the connection gear 33, and the tractor section 31 is driven as the platen 12 rotates. Therefore, platen 1
The printing mechanism 17 prints on the continuous paper 27 that has been marked 2, and the tractor section 31 prints on the continuous paper 27.
will be sent automatically. At this time, since the output of the drive signal to the fan motor 8 is stopped, the cut sheets 4 of the cassette 3 are not fed to the platen 12, and no jam occurs.

In this manner, by operating the switching lever 34, the operation of the auto sheet feeder 2 and the form tractor 26 can be selectively operated, and paper jams can be prevented from occurring.

In the above embodiment, two microswitches are installed, but only one microswitch may be installed to switch between the auto sheet feeder and the form tractor.

Further, it goes without saying that the structure of the auto sheet feeder and the form tractor is not limited to that of the above embodiment.

(Effects) According to the present invention, by providing a switching lever that selectively switches between driving the auto sheet feeder and the form tractor, it is possible to prevent the auto sheet feeder and the form tractor from being driven at the same time. It is possible to prevent the occurrence of clogging.

[Brief explanation of drawings]

1 to 3 are views showing one embodiment of the present invention, in which FIG. 1 is an overall perspective view of the printer, FIG. 2 is a side sectional view thereof, and FIG. 3 is the configuration of a portion of the switching lever. It is a diagram. 1...Printer, 2...Auto sheet feeder, 4...
Cut paper, 26... Form tractor, 27... Continuous paper, 34... Switching lever, 39... Micro switch, 40...・Microsinch, 43... Control circuit.

Claims (1)

[Claims] In a printing device that is equipped with an auto sheet feeder that automatically feeds single sheets and a form tractor that automatically feeds continuous sheets, a switching lever is provided to selectively switch between driving the auto sheet feeder and the form tractor. A printing device characterized by: