JPH0480128A - Cut sheet feed device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] A cut paper feeding device relating to a printer device, particularly a cut paper feeding device, in which a means for detecting the upper surface position of stacked cut sheets can be attached with high precision and with easy adjustment. The purpose of this system is to provide cut paper loaded on a paper feed cable that is controlled to be able to rise and fall freely, a pick roller that comes into contact with the top surface of the paper and feeds out the paper one by one, and a pick roller that is pivotally supported at one end. In the cut paper feeding device, the cut paper feeding device includes a pick frame swingably supported on a machine frame, and means for detecting the top surface position of the cut paper, wherein the top surface position detection means is integrated with the pick frame. It consists of a light blocking plate or a light reflecting plate that swings vertically, and an optical sensor installed on the machine frame side to detect the light blocking plate or light reflecting plate.

[Industrial application field]

TECHNICAL FIELD The present invention relates to a printer device, and more particularly to a paper feed device.

[Conventional technology]

FIG. 4 is a diagram showing an example of a cut sheet feeding device of a conventional printer. In the figure, 1 is a printer and 2 is a cut sheet. The printer 1 includes a paper feed cable 3 for loading cut sheets 2 to be printed, a lift control mechanism 9 for controlling the rise and fall of the paper feed cable 3, and a machine frame 4 fixed to the printer 1.
A paper feeding mechanism 5 attached to the machine frame 4 and a paper feeding mechanism 5
A top surface position detection means 6 detects the top surface position of the cut paper 2 from the movement of the cut paper 2, a pair of feed rollers 7 guides the fed-out force 2, and the cut paper 2 guided by the feed rollers 7. A pair of standby rollers 8 are provided for relaying.

The machine frame 4 has a feed roller 51 for feeding the cut paper 2.
．． A guide plate 4142 is attached for guiding through the reverse roller 56, feed roller 7, and standby roller 8. The paper feed cable 3 has an elevating side that includes a motor for raising the cut paper 2 loaded on the cable and feeding the paper by the pick roller 53? It is connected to the i1 mechanism 9.

The paper feed mechanism 5 includes a foot roller 51 that is rotatably supported on the machine frame 4, a pick frame 52 that is pivotally supported on a shaft 55 of the foot roller 51, and a pick frame 52 that is supported on the tip of the pick frame 52. , a pick roller 53 that is movable toward and away from the upper surface of the cut paper 2, and a pick frame 52.
It consists of a metal fitting 54 fixed to the feed roller 51, and a reverse roller 56 that prevents duplicate sheets of cut paper 2 from being fed out from the feed roller 51. The feed roller 51 and the pinocrawler 53 have a mechanism in which rotational motion is transmitted by a heald or the like (not shown). The pick roller 53 rotates in the six directions of arrows in order to feed out the cut paper 2 while contacting the upper surface of the cut paper 2 which is controlled to an adjustment holding position which will be described later. The metal fitting 54 swings integrally with the pick frame 52 in the direction of arrow B around the shaft 55 of the feed roller 51. Therefore, the metal fitting 54 moves following the force and the fluctuation of the top surface position of the paper 2.

The upper surface position detection means 6 is composed of a switch (for example, a micro switch, 7-inch, etc.) 61 that is provided so as to be able to come into contact with and separate from the metal fitting 54, and a switch holder 62 that holds the switch 61 on the machine frame 4. .

When the paper feed cable 3 is raised and the upper surface of the cut paper 2 pushes up the pick roller 53 a little, the metal fitting 54 moves to the right in the direction of the arrow B, and the switch 61 becomes in the EN state. This 0
The mounting position of the Sinchiro I is adjusted so that the upper surface position of the cut paper at the moment when it enters the PEN state matches the predetermined adjustment holding position (the feeding position where the pressing force and pressing position of the pick roller 53 on the cut paper 2 are optimal). Holder 62
It is set in machine frame 4 via .

When feeding of the cut paper 2 is started in response to a paper pick command from the printer 1, the pick roller 53 lowers its position in response to an increase in the supply amount of the cut paper 2, and the metal fitting 54 moves the arrow B in the left direction. , and when the switch 61 is pressed in the ON direction, the energization of the switch 61 drives the lift control mechanism 9, and the paper feed cable 3 is turned OFF when the switch 61 is turned OFF.
It controls the rise until it reaches , and then stops. The cut paper 2 fed out by the pinocrawler 53 as shown in FIG.
Further, the paper is guided in the direction indicated by the arrow via the feed roller 7 and the guide plate 42 and fed into the standby roller 8, after which printing processing is performed.

[Problem to be solved by the invention]

The switch 61 in the above-mentioned conventional upper surface position detection means 6 uses a mechanical contact. When the paper feed cable 3 is raised and the upper surface of the cut paper 2 reaches a position where the bin roller 53 is slightly pushed up, the movement of the contact of the switch 61 is accompanied by mechanical backlash, so the positional accuracy of the detection position is not good. , there is a large variation in the detection position on the top surface of the cut paper. Therefore, the paper feed cable 3 is detected at different detection positions.
The cut paper 2 is fed out while the pick roller 53 is stopped, but the pressure force applied to the cut paper 2 by the pick roller 53 at this time varies depending on the deviation of the detection position, resulting in poor paper feeding stability and the occurrence of jams. There is a flaw that causes this.

Therefore, conventionally, the proper position for attaching the switch 61 to the machine frame 4 via the halter 62 has been determined by trial and error, which has the disadvantage that attaching the switch 61 is time-consuming and labor-intensive.

The present invention has been made in view of the above-mentioned conventional drawbacks, and an object of the present invention is to provide a cut paper feeder in which a means for detecting the top surface position of stacked cut papers can be mounted with high accuracy and with easy adjustment.

[Means to solve the problem]

FIG. 1 and FIG. 2 respectively show means for solving the problem of the present invention. A cut paper 2 loaded on a paper feed cable 3 that is controlled to move up and down, a pick roller 53 that comes into contact with the top surface of the cut paper 2 and feeds out one sheet at a time, and a pick roller 53 that is pivotally supported at one end and is In a paper feeder comprising a pick frame 52 swingably supported by a frame 4 and a means 6 for detecting the upper surface position of the cant paper 2, the upper surface position detecting means 6 includes: A light shielding plate or light reflecting plate 64 that swings integrally with the pick frame 52, and a light sensor 6 installed on the machine frame side and detecting the light shielding plate or light reflecting plate.
It consists of 3. Further, the upper surface position detection means 6 includes:
a magnet 65 provided integrally with the pick frame 52;
A Hall element 66 installed on the machine frame side and detecting the magnet.
It is also possible to configure it from

[For production]

The paper feed cable 3 is raised by the lift control mechanism 9, and when the top surface of the cut paper 2 reaches the optimal adjustment and holding position (when the pick roller 53 slightly pushes up the top surface of the cut paper 2), a light shielding plate or a light reflecting By providing the plate 64 to block the detection optical path of the optical sensor 63 in a non-contact state or to receive reflected light, the detection position accuracy of the adjustment holding position on the upper surface of the cut paper 2 is improved, and the detection optical path of the optical sensor 63 is improved. By controlling the lift control mechanism 9 using the output, stable continuous feeding of cut sheets can be performed. Alternatively, there is also a detection method in which a magnet 65 is provided in place of the light shielding plate or light reflecting plate 64, and a Hall element 66 is used to detect the approach of this magnet.

〔Example〕

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

Note that, in order to make the explanation of the configuration and operation easier to understand, the same parts are given the same reference numerals throughout all the figures, and repeated explanation thereof will be omitted.

FIG. 1 is a layout diagram of main parts of a first embodiment of the present invention. Although the present invention can be practiced using a conventional configuration, the feed roller 51 in FIG. A simpler configuration is adopted in which the reverse roller 56 and the feed roller 7 are not used.

In the figure, a pick frame 52 is rotatably supported by a shaft 55 on a machine frame 4 fixed to the printer 1, a pick roller 53 is rotatably supported at one end of the pick frame 52, and the roller surface is cut. It comes into contact with the top surface of the paper 2 so as to be able to move toward and away from it, and when the top surface of the cut paper 2 slightly pushes up the roller surface of the pick roller 53 and rotates in the direction of the arrow 6, the cut paper 2 is guided by the guide plate 41 and the cut paper 2 is moved in one direction. It has a function of feeding out sheets one by one to the standby roller 8.

Reference numeral 64 denotes a light shielding plate or a light reflecting plate, which is attached to the other end of the pick frame 52 so that its plate surface is parallel to the plane of a circle centered on the axis 55. Reference numeral 43 denotes a support plate fixed to the frame of the printer I, and an optical sensor 63 is attached to one end of the support plate. The optical sensor 63 is, for example, a photointerrupter in which a light-emitting element and a light-receiving element are arranged facing each other at a required interval, or a photo-sensor in which a light-emitting element and a light-receiving element are arranged at a required interval and at a required angle, In the case of a photointerrupter, the swing path (direction of arrow B) of the light shielding plate 64 is arranged so as to intersect with the detection optical path without contact, and the position of the roller surface of the pick roller 53 can be adjusted relative to the light shielding detection signal. Detected. The detection optical path is provided in a direction perpendicular to the plane of the drawing. In the case of a photosensor, the position of the roller surface of the pick roller 53 is relatively detected by receiving the reflected light reflected by the light reflecting plate 64.

FIG. 2 is a layout diagram of main parts of a second embodiment of the present invention. In the figure, reference numeral 65 denotes a magnet (for example, a permanent magnet) attached to the light shielding plate 64 shown in FIG. 66
is a Hall element attached to the support plate 43 fixed to the printer 1, and the swing path of the magnet 65 (in the direction of arrow B)
The magnet 65 is placed in close proximity to the magnet 65 in a non-contact manner, and outputs an electrical signal by colliding with the lines of magnetic force of the magnet 65.

Fig. 3 is a diagram for explaining the present invention in detail, in which Fig. 3fa) is a control system block diagram, and Fig. 3(b) is a time chart (vertical axis is voltage, horizontal axis is time). show. Part 1 below
The operation will be explained with reference to the figure and FIG. Normally, a door switch 11 is provided at the front of the paper feeder, and when the door is closed at time t1, the door switch 1
1 is in the ON state, ! It is recognized by the lJa circuit 12 and drives the lifting motor 14 for the paper feed cable 3 via the motor driver 13.

At this time, the paper feed cable 3 rises and the loaded cut paper 2
At the position where the top surface of the pick roller 53 is slightly pushed up (time tz), the light shielding plate, light reflecting plate 64, or magnet 6
In response to the approach of the paper feed cable 3
The lifting motor 14 is stopped.

The pick roller 53 is rotated according to instructions from the printer 1 to feed out the cut paper 2.
The position of is lowered following the decrease of the paper feed cable 2, and when this is detected by the sensor at time t3, it is recognized by the control circuit 12, and the lifting motor 14 is activated via the motor driver 13 to raise the paper feed cable 3 again. The sensor outputs a detection signal at the position (time t4) where the top surface of the pick roller 53 is slightly pushed up by the loaded force and the control circuit 12 recognizes this, and the motor driver 13 The lifting motor 14 for the paper feed cable 3 is stopped via the . In this way, a repetitive control action is performed to hold the upper surface of the cut sheet 2 at a predetermined adjusted holding position.

Since the optical or magnetic detection means described above does not generate hacklash unlike mechanical detection means, stable and highly accurate sheet feeding control is possible.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the predetermined adjustment and holding position of the upper surface of the cut paper can be held with high precision, making it possible to perform stable paper feeding control, and the sensor installation can be done by adjusting the position. This has the effect of significantly reducing man-hours.

[Brief explanation of the drawing]

FIG. 1 is a layout diagram of the main parts of the first embodiment of the present invention, FIG. 2 is a layout diagram of the main parts of the second embodiment of the invention, and FIG. 3 is a diagram for explaining the invention in detail. , FIG. 4 is a diagram showing an example of a cut sheet feeding device of a conventional printer. In Figures 1 and 2, 2 is cut paper, 3 is a paper feed cable, 4 is a machine frame, 6 is a top position detection means, 52 is a pick frame, 53 is a pick roller, 63 is a light sensor, and 64 is a light shield. 65 is a magnet, and 66 is a Hall element. On the other hand, 4 rows of arrogance i ≧ ship p shield and "l shift 1st figure 55 axis\ 4, Isobashi 17gI) 27 52 pi 77f L- to diagram +Q ) Table'] Foam pick-up 7... Mouth 1.77 completed Z inner wide g (b) R f4 r-1- 2F≧6≦1? fi fake i ^1 fort t? 'M7Fub 夛) Figure 3 Figure 3

Claims (2)

[Claims] (1) A cut paper (2) loaded on a paper feed cable (3) that is controlled to be able to rise and fall freely, a pick roller (53) that comes into contact with the top surface of the cut paper (2) and feeds it out one by one, and A pick frame (52) pivotally supporting a pick roller (53) at one end and swingably supported by a machine frame (4), and means (6) for detecting the top surface position of the cut paper (2). In the cut paper feeding device comprising: the upper surface position detection means (6), the pick frame (
A light shielding plate or a light reflecting plate (64) that swings integrally with the light shielding plate (52)
); and an optical sensor (63) installed on the machine frame side to detect the light shielding plate or the light reflecting plate. (2) The top surface position detection means (6) includes a magnet (65) provided integrally with the pick frame (52) and a Hall element (66) installed on the machine frame side to detect the magnet. The cut paper feeding device according to claim 1, characterized in that: