JPS60257267A - Paper feeder for printer - Google Patents

Abstract

PURPOSE:To prevent blind printing and the attendant damge on a platen or the like from occurring when a paper-supplying unit is fitted, by a method wherein pinch rollers are automatically brought into contact with a platen when a paper- supplying unit is fitted. CONSTITUTION:A frame 1 on one side of the printer is fitted with a detecting switch 53 comprising an actuator 52 pressed against a fitting piece 30 for the paper-supplying unit 28. When the fitting piece 30 for the unit 28 is fitted to a guide shaft 5 and the unit 28 is turned with the shaft 5 as a fulcrum to fit a fitting piece 31 on the other side to a fitting shaft 32, the fitting piece 30 presses the actuator 52, whereby the switch 53 is turned ON, an electromagnet 54 is excited to pull a cam 19 counterclockwise, and the force of a spring 26 is exerted on a stopper 27 of an arm 17 through a lever 24. The arm 17 released from the cam 19 is turned, and the pinch rollers 23 are automatically brought into contact with the platen 2. Accordingly, even if an upper part of the platen 2 is covered by the unit 28 and the paper-supplying condition can not be confirmed, the pinch rollers 23 are securely brought into contact with the platen 2.

Description

[Detailed description of the invention] Technical field of invention The present invention relates to a paper feeding device for a printing machine.

Technical background of the invention and its problems Conventionally, there has been a printing machine that is equipped with a platen on which a pinch roller moves toward and away from it, a pin feed mechanism, and is further equipped with a selective paper feed unit to print on a single sheet. . When the paper feed unit is installed, the top of the platen will be covered, so
If the pinch roller forgets to touch the feed roller, the state of paper feeding to the platen cannot be confirmed, and over a long period of time, blank printing may damage the colliding portion of the platen or the like.

Purpose of the Invention The present invention has been made in view of the above points, and provides a paper feed device for a printing machine that can automatically bring a pinch roller into contact with a platen when a paper feed unit is attached to prevent damage caused by blank printing. The purpose is to obtain information.

Summary of the Invention This invention detects the state of a paper feed unit when it is attached to a frame using a detector, activates a drive source based on a detection signal from the detector, and operates a pinch roller by interlocking an operation unit with this operation. 2 is brought into contact with the platen automatically, so that blank printing and accompanying damage to the platen etc. can be prevented when the paper feed unit is attached, regardless of whether the user is conscious or not.

Examples of the invention An embodiment of this invention will be described based on the drawings.

A platen (2), which is a feed roller, and a bin feed mechanism (3) are mounted on opposing frames (1).

The pin feed mechanism (3) has a drive shaft (4) and a guide shaft (5).
) A sprocket wheel (7) driven by a drive shaft (4) and a paper presser (8) are attached to a pair of left and right holders (6) which are held so as to be slidable and fixed in any position. . Then, there is a paper feed motor (
9) The rotation of platen (2) and pin feed mechanism (3)
A transmission part fil for transmitting data to the frame (1) is attached to one side of the frame (1). This transmission section 101 is a paper feed motor (9)
Gear az and gear 0 mesh with drive gear Uυ directly connected to
This gear (l) is connected to the platen (2) on the same axis.
) is meshed with a gear circle that rotates integrally with the gear a3, and a nine gear α9 is fixed to the end of the drive shaft (4) (161).

Further, an arm C1η is attached to the frame (1) on the opposite side so as to be rotatable around the bottle bet, and a cam C1η is also attached to the frame (1) on the opposite side.
'J and the operating lever handle, which is the operating part, are held by the pin Qυ so that they rotate together, and both ends of the toggle spring (c) are held at the lower end of the operating lever (4) and the frame (1). has been done. A lever r241 supporting a pinch roller (c) is rotatably attached to the tip of the arm aη via a pin (c). This lever (to)
is biased counterclockwise by a spring (4), and the stop position is determined by a stopper (3) formed on the arm (Lη).

Next, a paper feeding unit (c) is provided. This paper feeding unit) (21G) attaches the mounting piece (to) 6υ attached to the pair of left and right side plates (c) to the guide shaft (
5) and the mounting shaft C, which is the holding part fixed to the frame (1).
It is held by engaging with 31D. Side plate (c)
A holder for accommodating the paper space is detachably attached to the holder, and a paper feed roller (3 rollers and a paper feed roller 267 that contacts the pinch roller) is provided.

One paper feed sheet roller (c) and a pulley (41J is supported by a spring (to)) are urged upward and rotate around a pin t31.The feed arm (supported by 4G) In (2), a pulley (four moats) connected to the pulley rectifier via a belt 02 and an input gear (input gear) meshing with gear I on the platen (2) are coaxially connected. .Furthermore, one side plate has a gear L.
4!9 (4E9 Gl?) @8 (41 is provided. Gears (C) to (F) are meshed sequentially, and gear (4E9 Gl?) @8 (41 is provided.
8 is connected to the cam roller via a one-way clutch (not shown), and the gear 4 meshing with the gear 4 is connected to the paper feed roller 6.
It is fixed at one end of η.

Furthermore, the feed arm (41) supports a roller 6υ that comes into contact with the cam □□□.

Further, a detection switch, which is a detector having six actuators pressed by an example of a mounting piece of the paper feed unit (to), is attached to the one frame (1). The plunger of an electromagnet (b), which is a driving source connected to a power source via this detection switch (to), and the cam 11 are connected to the rond (to).

In such a configuration, as shown in Fig. 4, even if the pinch roller (C) is separated from the platen (2), the guide shaft (5) can be fitted between the mounting pieces of the paper feed unit (goods). Then, the paper is fed two nits (with this guide shaft (5) as a fulcrum)
When the other mounting piece 6υ is fitted to the mounting shaft (3) by rotating the mounting piece (7), the detection switch ei3dE presses the actuator t52 as shown in Fig. 3.
When ON, the electromagnet 54) is energized and pulls the cam a9 counterclockwise, and the force of the spring (e) is applied to the lever c! 4)
The arm αη released from the cam Q9 rotates and the pinch low 2 acts on the stopper (2) of the arm housing η.
(c) automatically contacts the platen (2). On the other hand, the gear I and the input gear (441) of the paper feed unit (2) mesh with each other. Then, when the paper feed motor (9) is rotated in the direction of the dotted arrow as shown in FIG. The cam 5Q and the paper feed roller (to) rotate in the direction of the dotted arrow, and the roller 6υ is pushed by the cam no. bends and rotates the paper feed roller (towards).
feeds one sheet of paper from the holder (toward) to the platen (2). Next, the rotation direction of the paper feed motor (9) is switched in the direction of the solid line arrow, and each rotating part also rotates in the direction of the solid line arrow, but the gear (the monk and the cam group are connected via a one-way clutch, so The cam stops at the position where the Girovert contacts the roller 6υ due to the return force of the spring (50m), allowing the feed arm (41) to return.Then, it rotates in the direction of the solid line arrow between the sheets fed from the holder. The platen (2) and the paper feed roller (37) are used to feed the paper.

Therefore, even if the top of the platen (2) is covered by the paper feed unit (to) and the paper feeding status cannot be checked, the platen (2)
), the pinch roller (C) is always in contact with the platen (2), so the platen (2) and the pinch roller (C) feed the paper that has not been supplied to the platen (2) toward the printing section. therefore,
Blank printing and damage to the platen (2) etc. caused by this can be prevented.

As shown in FIG. 2, when the paper feed unit 2 is removed, the detection switch (to) is turned OFF and the power to the comb electromagnet 6 is cut off. When the force of the electromagnet stops working, the control lever can be moved manually. As a result, when the operating lever is tilted to the right as shown in Fig. 4, the cam (13) pushes up the rear part of the arm, and the pinch roller (to) separates from the platen (2). By tilting the operating lever to the left, the arm (17) is released from the cam Q9, and the pinch roller (C) is rotated by the force of the spring 0Q and separated from the platen (2).Therefore, the paper feed unit When (c) is not used, the pin feed mechanism (3) is used to feed the bins 9 or the platen (2) is used, depending on the paper used.
It is possible to select either friction feeding using a pinch roller (c) or a pinch roller (c).

Effects of the Invention Since the present invention is configured as described above, when the paper feed unit is attached, the drive unit is activated by the operation of the detector to automatically bring the pinch row 2 into contact with the platen, regardless of whether caution is given or not. Therefore, it has the effect of preventing blank printing and preventing damage to the platen and the like.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal side view showing the paper feed unit installed, FIG. 2 is a longitudinal side view showing the paper feed unit removed, and FIGS. FIG. 4 is a longitudinal side view showing the movement of the pinch roller toward and away from the platen. DESCRIPTION OF SYMBOLS 1... Frame, 2... Platen, 3... Pin feed mechanism, 5... Guide shaft (holding part), 9... Paper feed motor, 20... Operation lever (operation part), 23・
...Pinch roller, 28...Paper feed unit, 32...
・Mounting shaft (holding part), 53...Detection switch (detector), 54...Electromagnet (drive part) Applicant: Tokyo Electric Co., Ltd.

Claims (1)

[Claims] A frame that holds a feed roller and a pin feed mechanism each driven by a paper feed motor is provided with a mounting section for selectively attaching and detaching a paper feed unit, and a pinch roller is moved toward and away from the platen. further comprising: a detector for detecting a mounting state of the paper feed unit on the frame; and a drive source for driving the operating section according to a signal from the detector to bring the pinch roller into contact with the platen. A printing machine paper feeding device featuring: