JPS6099677A - Printer with automatic paper-supplying device - Google Patents

Abstract

PURPOSE:To prevent misoperations from occurring, by a method wherein a constant-rotation clutch provided in a transmitting system for connecting a printer and a paper-supplying device to each other when a power source for the printer is thrown in or at the time of selective use of the paper-supplying device is located at a home position when starting the use of the paper-supplying device. CONSTITUTION:When the power source is thrown in to a drive source (pulse motor) for rotating the platen 1 of the printer, or by operating a paper-supplying mode selecting switch provided for the printer, an electric current is fed to the pulse motor for the platen 1 for a fixed period of time, thereby rotating the platen 1 by an amount sufficient for rotating the constant-rotation clutch by one cycle. By this, the clutch located at an intermediate position is returned to the home position to prepare for a normal paper-supplying operation. The clutch (in a disengaged condition) located at the home position is maintained at that position.

Description

Detailed Description of the Invention The present invention feeds sheets 1 to 1 stored in a paper feed stacker one by one to a platen equipped with a print head such as a thermal printing element or an impact dot element, and performs printing by intermittent rotation of the platen. The present invention relates to a printing device equipped with an automatic paper feeding device that prints while feeding and stores the paper in a paper discharge stacker after printing is completed.

In general, a printing device such as a printer holds paper wrapped around a platen made of a rotating cylinder, and prints with a print head while feeding the paper by rotating the platen.

An automatic paper feeding device is known that feeds sheets of paper stacked and stored in a paper feed stacker one by one to the platen of a printing device, and stores the printed paper sheets from the platen into a paper discharge stacker.

In this type of device, when the paper feed roller installed in the paper feed stacker is driven and connected to the rotating shaft of the platen by a transmission means such as a gear or a belt, the following problems occur. However, when both are rotated in forward and reverse directions at the same time, there is an inconvenience that the platen feeds the next sheet of paper as the platen advances during printing, and a clutch must be installed between the platen and the paper feed roller. is an electromagnetic clutch, and the clutch is connected to a transmission state in response to a paper feed instruction signal from the printing device.

In this case, the printing device and the paper feeding device must be connected by electrical signals, and there is a drawback that the automatic paper feeding device, which is used in various existing printing devices, cannot be used.

Therefore, the present applicant connected the rotation axis of the platen and the rotation axis of the paper feed roller with a constant rotation clutch such as a one-turn clutch, and connected this clutch to a transmission state when the platen rotated a predetermined amount, and then rotated the platen forward or The reverse rotation is transmitted to the paper feed roller, and when the clutch has made a predetermined rotation (one rotation, half a rotation, etc.), the clutch is automatically disengaged and the paper feed roller finishes feeding the paper. created.

However, if the user accidentally turns off the power to the device while the constant rotation clutch is rotating to feed paper, or when a paper jam is discovered and the power is turned off, the constant rotation clutch may change to the home position (initial position). ) may come to a stop in a state where the vehicle is not located. In this case, if you try to turn on the power again and continue operation, the initial position of the constant rotation clutch will be incorrect, causing an unexpected malfunction.

The present invention aims to solve the above-mentioned drawbacks, and aims to reduce the constant rotation in the transmission system that connects the printing device and the paper feeding device when starting to use the paper feeding device, turning on the power of the printing device, or selecting the use of the paper feeding device. The clutch is positioned at the home position.

The configuration will be described in detail below based on one embodiment shown in the drawings.

The printing device indicated by the general symbol (5) is equipped on a platen (1), a bed carriage (2) that can reciprocate in the horizontal direction along the platen (1), and a kitchen carriage (2). It is equipped with a print head (3) and a print head (2).
is supported on a shaft attached to a frame, and is connected to a stepping motor so as to move left and right along this shaft, and is controlled by the motor to step to each printing position.

The platen (1) is composed of a rotating cylinder, and a steering/knopping motor (not shown) is centered around the rotating shaft (1a).
The paper is rotated by a predetermined angle at a time, and the paper is fed along with printing by the reciprocating movement of the gutter.

Therefore, the rotation axis (1a) of the platen (1) constitutes the paper conveyance rotation axis in the platen.

The paper feed device indicated by the overall symbol (B) is the paper feed stacker (8)
A device frame (11) consisting of a paper feeding means (9) for separating and feeding sheets one by one from this stacker (8), and a paper discharge stacker (10) is attached to the printing device (5).
The paper loaded and stored on the paper feed stacker (8) is fed one by one to the platen (1),
After printing on the platen (1), the paper is transferred to the paper output stacker (10).
).

Therefore, the paper feed stacker (8) is composed of a normal paper tray, (8a) is a paper side edge guide, (8b) is a bottom plate, and the paper feed means (9) is composed of a normal paper feed roller.
(12) are corner claws that engage with the left and right ears of the second sheet of the stacker (8).

Therefore, when the paper feeding instruction symbol is obtained from the printing device (5) and the paper feeding means (9) is started, only the topmost paper on the stacker (8) will pass over the corner claw (12) and reach the platen. 1) side, and the illustrated guides (13) and (1)
Along the entrance path (1) formed by step 4), the paper leading edge is guided between the platen (1) and the pinch roller (1a).

The illustrated one is a paper feed roller (9) that constitutes the above-mentioned paper feed means.
) to the rotating shaft (1a) of the platen (1) with a transmission means (15) such as a gear or a belt, this transmission means (
15) Connect the internal clutch (overall symbol C) to a transmission state by reversing the platen (1) by a predetermined angle, so that the platen (1) rotates forward in the print line feed direction and the paper feed roller (9) is driven to rotate. It is composed.

In the illustrated embodiment, a gear (16) is attached to the rotating shaft (la) of the platen (1), and the frame (1
It is designed to mesh with the gear (17) provided in 1).

This gear (17) is the gear (18) (19) (20) (2
1) Rotating shaft (9a) of paper feed roller (9) via (22)
) is connected to the gear (23).

The gears (20) and (21) are connected to each other through a ratchet mechanism (24) when the platen (1) is reversed by a predetermined amount, and in the connected state, the gears (20) and (21) make one rotation (not necessarily one rotation). They are designed to separate from each other when they rotate a predetermined amount (a predetermined amount of rotation, such as a predetermined angle or several rotations).

Therefore, the ratchet mechanism (24) has a ratchet pawl (24a).
), a cam follower (26) and a cam (27) that are integrated with this lever (25) are related as follows.

A cam (27) is disposed coaxially with the gear (18) via a spring clutch (28), and the cam (27) rotates the gear (18) forward (counterclockwise in the figure) and reverse rotation. In addition, this cam (27) has a pin that releases the spring clutch (28), a plate spring (27b), and a plate spring (27b) that prevents the cam (27) from rotating beyond a predetermined angle. Place and develop.

(Details will be described later) This cam (27) is provided with a cam follower (26) as shown in the figure, and a lever (25) that swings together with the cam follower (26) engages with the ratchet pawl (24a). It looks like this.

The ratchet mechanism (24) includes a ratchet wheel (24b) integrated with the gear (20) on the driving side.
The gear (2) on the paper feed roller (9) side is loosely fitted coaxially with
The ratchet pawl (24) is attached to the disk (21a) integrated in 1).
a) is provided, and when the ratchet pawl (24a) and the wheel (24b) mesh, the rotation of the gear (20) is transmitted to the gear (21) and then to the paper feed roller (9). The ratchet pawl (24a) is biased by a spring (24C) in the direction of engagement with the wheel (24b), and the lever (24a)
5) is engaged to release the ratchet pawl (24a).

When the lever (25) is located in the recess formed on the outer periphery of the disk (21a), it engages with the ratchet pawl (24a), and when it is located on the outer periphery, it separates from the ratchet pawl (24a). Therefore, when the lever (25) is removed from the recessed part of the disk (2ta) that rotates together with the gear (21), the ratchet pawl (24a) is brought together and the gear (20) and the gear (2ta) are aligned.
1), and when the disk (21a) rotates and the tip of the lever (25) falls into the recess, the ratchet pawl (2)
4a) is removed, and the rotation of gear (20) is not transmitted to gear (21).

The rotating shaft (9a) of the paper feed roller (9) and the gear (22) attached thereto have a ratchet structure (29) as shown in the figure, and are a one-way clutch that transmits rotation only in the paper feeding direction of the paper feed roller (9). It is connected via.

This is to prevent the paper feed roller (9) from rotating in the opposite direction to the paper feeding direction when the platen (1) is reversed, and is not limited to a ratchet structure, but may be a normal one-way clutch.

To explain the structure in detail according to the second diagram for explaining the operation, first, when it is necessary to feed paper in the paper feeding device (c), the stepping motor of the platen (1) is controlled and the platen (1) is
) by a predetermined amount in the counterclockwise direction shown in the figure.

The one shown is a sensor (when there is no paper in Sl,
That is, when the paper is not loaded on the platen (1) in the initial state of the device, or when the trailing edge of the previously printed paper passes the sensor (S), this is detected and the platen (1) is loaded.
) is supplied with a predetermined pulse of reverse current to the stepping motor to reverse it by a predetermined amount.

Then, power is transmitted in the order of gears (18), (19), and (20) in the head circumference state, but between gears (20) and (21), the ratchet pawl (24a) is moved by the lever (25) to the wheel (
24b) and the rotation of the gear (20) is caused by the rotation of the gear (21
) and the paper feed roller (9).

After a moment, the gear (18) is reversed and the spring clutch (28)
The cam (27) rotates counterclockwise and the cam follower (26) swings to the position shown in the figure, and the lever (25) integrated with it also swings to the position shown in the figure against the spring (30). move.

Then, the tip of the lever (25) becomes the ratchet pawl (24a).
Separate the ratchet 1~claw (24a) from the spring (24
C) engages the ratchet wheel (24b).

Therefore, the rotation of the gear (20) is transmitted to the gear (21), and the disk (21a) also rotates in the same way.

At this time, the rotation of the gear (21) is caused by the rotation of the gear (21) of the paper feed roller (9).
22) is transmitted to the gear (22) and paper feed roller (9)
A one-way clutch such as a ratchet structure (29) is used between the roller and the rotating shaft (9a) so that no power is transmitted to the roller and the roller remains stationary.

Next, when the platen (1) is rotated clockwise in the drawing, power is transmitted from the gear (17) to the gear (22), and the paper feed roller (9) starts rotating.

During this process, the cam (27) of the gear (18) rotates in the direction of the arrow in the figure (C), and when the pin (27a) hits the leaf spring (27b), the leaf spring (27b) blocks its rotation and the spring clutch ( 28) is disengaged and the cam (27) stops at the home position shown in figure (A).

After the lever (25) passes through the concave part of the disc (21a) of the gear (21) at the position shown in Figure 9, the cam (27) moves to (A).
When the home position shown in the figure is reached, the lever (25) is biased clockwise by the spring (30) and the tip of the lever (25) is moved to the disk (21).
It abuts on the outer periphery of a).

Platen (Due to the phantom forward rotation, the disk (21a)
As it rotates, the tip of the lever (25) falls into the concave part, and the ratchet pawl (24a) separates from the wheel (24b), returning to the state shown in the figure.

At this time, the paper feed roller (9) stops, and the paper fed out by the paper feed roller (9) is fed to the platen (1).
As the paper rotates, the leading edge of the paper reaches the printing position.

Because the force is transmitted from the platen (1) to the paper feed roller (9), even if the platen (1) rotates in the line feeding direction during the printing process, the power is not transmitted to the paper feed roller (9), and the platen The driving force of the platen (1) is transmitted to the paper feed roller (9) only when the platen (1) is reversed by a predetermined amount.

The amount of reversal of the platen (1) is set by the shape angle (t) of the cam (27) in the illustrated embodiment, but it is preferably an amount that is sufficiently larger than the pack feed amount of paper during the printing process.

In such a device, the present invention provides a rotating shaft (
1a) and the rotating shaft (9a) of the paper feed roller (9). When it stops in the state shown in Figure (C) and then moves on to the next operation (paper feeding cycle), the constant rotation clutch is at its home position (as shown in Figure 2 (I ) becomes incorrect and the transmission means (15) malfunctions.

Therefore, when the power is turned on to the drive source (pulse motor) that rotates the platen (1) of the printing device, or when the paper feed mode selection switch prepared in the printing device is operated, the platen (1)
) is rotated to return the stopped constant rotation clutch to the home position, and the constant rotation clutch (disengaged) in the home position is maintained at position 5.

As shown in the control chart in Figure 3, when the device is powered on or the paper feed mode switch is selected, the platen (1
) sends current for a certain period of time to the pulse motor of the platen (1
) rotate quickly enough for the constant rotation clutch to rotate for one cycle.

Then, the constant rotation clutch in the intermediate position returns to the home position and prepares for the next positive paper feeding.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is an explanatory diagram of the overall structure, FIG. 2 (C) and (C) are explanatory diagrams of the operating state, and FIG. . Print head/curve (3) Platen...(1) Paper feed stacker...(8) Transmission means... (1,5
) Paper discharge stacker - (10) ') Ratsu-1-... (24a) (24b) (2
5) (26) and (27) Cleaning of page 1 (no change in content) Figure 6 (b) Handbook sale correction date February 17, 1980 Mr. Commissioner of the Patent Office),',t□P 1 Indication date of the case 1,058 years Saiji Kougou JIF page No. 208114 2 Name of the invention 3 Person making the amendment January 31, 1980 (Date of dispatch) 5 Characters and dimensions of the drawing 6 Amendments Contents As per Rika Tsuki

Claims (1)

[Claims] A paper feed stacker and a paper ejection stacker are installed on the platen of a printing device equipped with an appropriate print head, the paper on the paper feed stacker is sequentially fed to the platen by a paper feed roller, and the paper after printing is ejected. A printing device equipped with a paper feeding device housed in a stacker is connected to the rotating shaft of the paper feeding roller and the rotating shaft of the platen by a transmission means via a constant rotation clutch, and the paper feeding roller is driven by the rotation of the platen. The automatic printer is configured to feed out the paper at a time, and when the printing device is turned on or an automatic paper feeding mode is selected, the platen (1) is rotated by a certain amount and the constant rotation clutch is positioned at the home position. Printing device with paper feed device.