JPS60244571A - Automatic paper attracting apparatus - Google Patents

Abstract

PURPOSE:To make it possible to dispense with a sensor for detecting the presence and absence of printing paper, in a printing apparatus, by providing an automatic attracting switch turned ON and OFF in the second revolving region of a bale control lever. CONSTITUTION:When the separation and contact operation of a bale shaft 5 is performed without operating an automatic attracting switch 17, a bale control lever 16 is operated between X- and Y-positions of the first revolving region thereof. When the automatic suction switch 17 is operated, if the lever 18 is operated from the Y-position to the Z-position in such a state that printing paper 11 is preliminarily held between a platen 1 and a pressure roller 2, an automatic attracting switch kick-out part 18 presses the automatic attracting switch 17 to change over said switch 17 from an ON-state to an OFF-state. Then, a paper feed motor 19 is allowed to start rotation in a definite amount and automatic attracting operation is completed because said rotation in the definite amount corresponds to a paper feed amount generated when the platen 1 is rotated through a belt 20 and the first printing position of the paper 11 is opposed to the position of a printing head.

Description

Detailed Description of the Invention [Technical Field 1] The present invention relates to an automatic paper suction device, and more particularly to an automatic paper suction device that eliminates the need for a sensor for detecting the presence or absence of paper and can extend the life of an automatic suction switch. .

[Prior Art IIi] An example of a conventional paper automatic suction device will be described with reference to FIGS. 1 and 2.

The bale shaft 5 is in contact with the platen l (second
When the bail arm 6 closes the contact 9 of the automatic suction switch 8, the printing paper 11 is moved between the platen 1 and the pressure roller 2. It is rolled up as the platen l rotates in the direction of the arrow from the contact position,
The first print on the print paper 11 reaches a position facing the print head 12, and feeding of the print paper 11 is stopped at that position. In this state, when the bail roller is moved from the separated state (veil roller 4') to the contact state s (veil roller 4), the delivery side of the printing paper 11 is pressed against the platen 1 without bulging. .

However, this technique is based on the premise that the bail shaft 5 is moved toward and away from the printing paper 11 already wrapped around the platen 1, which causes the following inconvenience. That is, since the bail arm 6 that turns the automatic suction switch 8 off and on is directly connected to the bail lever 7, the automatic suction switch 8 may be turned on by the movement of the veil lever 7 toward and away from the valve. If the bail lever 7 is released when the printing paper II is already wrapped around the platen 1, there is an inconvenience that a new printing paper 11 is sent to the platen L without printing on the wrapped paper portion. . Therefore, in order to determine whether the separating operation of the bail lever 7 is to locate the beginning of the printing paper 11 or to simply align the printing paper 11, it is necessary to check the presence or absence of the printing paper handle 1. It becomes necessary to install the paper presence/absence detection sensor 13 in front of the pressure roller 2 for detection. On the other hand, bail shaft 5 other than cueing
Since the automatic suction switch 8 is turned on and off during the engagement and separation operations, the automatic suction switch 8 is subject to significant wear and tear, and there is a problem in that it is necessary to use a highly durable automatic suction switch 8.

[Object of the Invention] The object of the present invention is to solve the above-mentioned problems, and it is possible to eliminate the need for a sensor for detecting the presence or absence of printing paper, and also to reduce the cost by eliminating the need for an automatic suction switch and chi to be very durable. An object of the present invention is to provide an automatic paper suction device that can be used with the following.

[Structure of the Invention] In order to achieve the objects and demerits of the present invention, the present invention provides a system in which a bail control lever is linked with a bail arm that pivotally supports a bail roller that can be moved into and out of a platen. A cam that brings the bale roller into a state where it can come into contact with and leave the platen in response to the first rotation range, and which maintains a state in which the bale roller is in contact with the platen in response to the N42 rotation range of the bail control lever. In addition to providing a mechanism, this configuration also includes an automatic suction switch that is turned on and off in the second rotation range of the bail control lever.

[Description of Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. - FIG. 3 is a side view of one embodiment of the present invention.

4m is a side view for explaining the operation of the same embodiment.

In FIGS. 3 and 4, the same parts as those shown in FIGS. 1 and 2 are designated by the same reference numerals, and their explanations will be omitted.

In FIG. 3, the bail arm 6 extends in the vertical direction, and its upper part is bent toward the left side, that is, toward the platen L. A bail shaft 5 is mounted on the bent end, and the bail arm 6 is mounted on the shaft. A bail roller 4 is rotatably mounted on the shaft 5.

The bail arm 6 has a connecting pin j slightly below its center.
A circular cam follower 14 is protruded from the lower end of the bail arm 6, which is rotatably supported by a fixed portion via a, and is slightly inclined toward the platen l side. 15 is a cam,
The cam 15 is formed with a cam hole 15a having a substantially inverted r<J shape, and the direction of the upper hole of the cam hole 15a is parallel to the longitudinal direction of the bail control lever 16, which will be described later. The cam follower 14 is freely engaged in the cam hole 15a. Also, cam 15 no 11 is a bail control lever! 6 and is interlocked with the rotation of the bail control lever 16. The lower side of the bail control lever 16 is rotatably supported on a fixed part via a connecting pin 1lla, and an automatic suction switch protrusion 18 is protruded from the lower end of the bail control lever 16. Automatic suction switch 17 near the right side of 18
is located.

With this configuration, the movement of the bail control lever 16 can be transmitted to the bail arm 6 via the cam 15 and the cam follower 14, but in this case, the second rotation range of the bail control lever 18 in FIG.
When moving to the position, the cam follower 14 moves into the cam hole 15a.
The cam 15 simply moves freely from the center of the cam hole 15a to the upper end of the cam hole 15a, and the cam 15 does not transmit the movement of the bail control lever IB to the bail arm 6 via the cam follower 14. The same state as in the 1B/Y position is maintained, that is, the bail shaft 5 maintains the abutting state, and the bail shaft 5 does not press the platen l excessively. Further, when the bail control lever 18 moves to the second rotation range, that is, from the X position to the Z position, the automatic suction switch 17 activates the start of automatic sheet suction and cueing.
is turned on and off by the automatic suction switch protrusion 1B of the bail control lever 1B. Note that 18 is a paper feeding motor, and 20 is a belt.

Next, the operation of this embodiment will be explained based on the drawings.

Since it is configured as above, automatic suction switch 1
7 turns off and on only when the bail control lever 1B moves between the second rotation range, that is, between the X position and the Z position. That is, when the bail shaft 5 is moved toward and away from the automatic intake switch 17 without operating the automatic suction switch 17, the bail control lever 18 is operated in the first rotation range of the bail control lever 16, that is, between the X position and the X position. . On the other hand, when operating the automatic suction switch 1'7, first place the printing paper 11 between the platen l' and the pressure roller 2, and then
When the automatic suction switch is operated from the IF position to the Z position, the automatic suction switch pusher 18 presses the automatic suction switch 17, causing the automatic suction switch 17 to transition from the OFF state to the ON state.

This starts a certain amount of rotation of the paper feed motor 18, and this certain amount of rotation is transmitted to the platen through the belt 20.
The automatic suction operation is completed because this corresponds to the paper feed amount such that the first printing position of the printing paper 11 and the position of the printing pad 12 face each other.

As described above, since the operation of the veil control lever 16 from the X position to the Z position is obviously performed by the operator for automatic suction, it is assumed that the printing paper 11 is set, and the printing paper 11 is The paper presence/absence detection sensor 13 that detects the presence or absence of paper is not required, and the automatic suction switch 17 is not activated except during automatic paper suction, so the automatic suction switch 17 is always activated when the bail arm 6 is engaged or separated. Compared to this, the frequency of use is reduced, which has the effect of increasing the lifespan of the automatic suction switch. Furthermore, the direction of operation of the bail control lever IB from the X position to the Z position is as follows.
This is the same direction as the forward rotation of the platen l when viewed from the operator's perspective, and has ergonomic significance in that the consistency of the paper feeding operation is maintained.

[Effects of the Invention] As explained above, the automatic paper suction device according to the present invention can eliminate the need for a sensor for detecting the presence or absence of printed paper, and furthermore, the automatic paper suction switch is activated except when automatically sucking paper. Therefore, the frequency of use can be reduced compared to an automatic suction switch that always operates when the bail arm moves in and out.
The life of the automatic suction switch can be increased, the automatic suction switch does not require much durability, and a low-cost one can be used.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a conventional automatic paper suction device. FIG. 2 is a side view of the same embodiment. FIG. 3 is a side view of one embodiment of the present invention. FIG. 4 is a side view for explaining the operation of the embodiment. l...-Platen 2...-Pressure roller 3...-Pressure roller 4.4'...Bale roller 5...ΦBale shaft 6...Bale arm 6a...Connection pin 7...Bale lever 8 Fists/Automatic suction switch 9...Contact point 1011 of automatic suction switch/Torsion spring 11-...
Printing paper 12... Φ print head 13... Paper presence/absence detection sensor 14... Fist cam follower 15... Cam 15a @ @ cam hole 1Bφ... Bale control reno kuichi 1ea ・Φ connection bin 17・War・Automatic suction Switch 1111--Automatic suction switch protrusion part 19...
Paper feed motor 201/belt Applicant: Japan Electric Co., Ltd. II Figure jlB Figure 4■

Claims (1)

[Claims] A bail control lever is interlocked with a bail 7-me which pivotally supports a bail roller that can be moved into and out of the platen.
The bail roller is in a state where it can move toward and away from the platen corresponding to a first rotation range of the bail control lever, and the bail roller is brought into contact with the platen corresponding to a second rotation range of the bail control lever. An automatic paper suction device comprising: a cam mechanism that maintains the contact state; and an automatic suction switch that is turned on and off only in a second rotation range of the bail control lever.