JPH03272937A - Cut sheet feeder - Google Patents

Abstract

PURPOSE:To feed cut paper sheets in two bins with a simple structure by setting a prescribed clearance on a pick-up roller driven by the joint of a step motor which revolves in the normal and reverse directions, gear system and a unidirectional clutch. CONSTITUTION:The pick roller 7, 8 of each bin of a cut paper sheet feeder 1 possesses the clearance theta (= paper transport distance from the pick rollers to a platen pinch roller 4 - paper sheet transport distance up to the change of revolution direction of a step motor 5 + margin), and is driven by the step motor through each of unidirectional clutches 9, 19 and a gear system. When a paper sheet is transported from one bin by the normal and reverse revolutions of the step motor 5, a trouble in which the pick-up roller facing the other bin operates and an unnecessary paper sheet is picked up is prevented, and the selection of bins can be surely carried out with a simple structure.

Description

[Detailed Description of the Invention] [Summary] Regarding a two-bin type cut sheet feeder having one step motor and a feed roller for paper relay, to perform bin selection without trouble using forward and reverse rotation of the step motor. The purpose of the present invention is to provide a canted sheet feeder with a simple structure that allows the user to feed the bins by one step motor and a feed roller for relaying paper to the platen pinch roller. driving a first pick roller and the feed roller;
In a two-bin type cut sheet feeder that drives the second pick roller of two bins and the feed roller by reversing the step motor, there is a gap between the first and second pick rollers. A clearance corresponding to (paper transport distance to the platen pinch roller) - (paper transport path M from the predetermined pick roller until the rotational direction of the step motor changes) 10 (margin) is provided.

[Industrial application field]

The present invention relates to a two-bin type cut sheet feeder having one step motor and a paper relay feed roller.

(Prior Art) A conventionally known example of the structure of a cut sheet feeder having two bins is Japanese Patent Publication No. 5B-90972.
In this structure, the forward and reverse rotation of the motor is transmitted to the pick rollers for bins 1 and 2 via a one-way clutch, so the cut sheet feeder is arranged so that the distance between the platen and pick roller is less than the minimum media length. There are significant implementation constraints. For example, if the first bin is designed to be used with postcards lying on its side, the distance between the platen's pinch roller and pick roller must be 100 mm or less. When this distance exceeds 100 TIa, a relay feed roller is installed on the way, and a one-way clutch or planetary gear mechanism is used.
A mechanism that stops the rotation of the pick roller midway (to prevent the next sheet from being picked) can be considered. In this case, the rotation of the motor in the opposite direction to that of rotating the big roller is used to rotate the feed roller.

This type of cut sheet feeder is shown in FIG.

In the figure, 1 is Cut Sea I feeder, 2 is Brown,
3 is a print head, and 4 is a platen pinch roller.

The cut sheet feeder 1 has one steering knob motor 5.
, a feed roller 6, and an I-bin pick roller 7.
It is equipped with a 2-bin Bic Roller 8. Gears 12, 13, and 14, 15, and 16 are arranged between a gear 10 that is connected to the big roller 7 via a one-way clutch 9, and a gear 11 that is coaxial with the feed roller 6. Gears 12 and 13 are arranged coaxially and connected via a one-way clutch 17. gear 12 is gear 10
The gear 13 meshes with the gear 11. gear 1
5.16 is arranged coaxially and one-way clutch 18
are connected via. Gear 715 meshes with gear 10 via gear 14, and gear 16 meshes with gear 11.

Furthermore, a gear 21 is connected between the gear 1° and the gear 20 that is connected to the big roller 8 via the one-way clutch 19.
゜22.23,24. is located. Gear 22 is
It is connected to the step motor 5 and meshes with the gear 10 and the gear 21, and also with the gear 2o and the gears 23 and 24.

Feeding of paper to the platen pinch roller 4 by the canted sheet feeder 1 is performed as follows.

When feeding paper by Bicroll Rough for one bin, the step motor 5 is rotated in the clockwise direction indicated by the solid arrow.

As a result, the one-way clutch 9 is operated to rotate the bicking roller 7 in the clockwise direction shown by the arrow to bink one bin of stored paper.

At this time, the two bin big rollers 8 do not rotate due to the action of the one-way clamp 190. When this paper is big,
One-way clutch 7ch 18 is not activated, but one-way clutch 7 is activated, and the rotation of the pick roller rough is caused by gear 10.
12, 13, and 11 to the feed roller 6, which rotates in the clockwise direction shown by the arrow. When the picked paper 100 passes through the feed 1' roller 6 and is detected by the sensor 25 on the cut sheet feeder side, the steering knob motor 5 stops. 1. Therefore, the next paper pick will not be performed. Thereafter, the step motor 5 starts to rotate in reverse as indicated by the dotted arrow, but at this time, the one-way clutch 17 is not activated and the one-way clutch 18 is activated. In this case, the rotation of the gear 10, which is driven counterclockwise by the reversal of the step motor 5 (at this time, the Bic 1 Fuller 1 does not rotate due to the action of the one-way clutch 9), is carried out through the gears 14, 15, 16, 1.1. This is transmitted to the feed roller 6, which rotates clockwise and conveys the paper to the platen pinch roller 4, where skew correction is performed.[Problems to be Solved by the Invention] However, this In cut sheet feeder 1, paper 10
Feed roller 60 after 0 reaches feed roller 6
Since the rotation uses the reverse rotation of the step motor 5,
When the step motor 5 reverses, the one-way clutch 1
9 is activated, the pinocrawler 8 of the second bin rotates, and the paper stored in the second bin is inconvenienced.

There are three possible ways to solve this problem:

■In addition to the step motor, a solenoid is provided to turn on/off power transmission between the big roller and feed roller.

■Separate motors are provided for the 1st and 2nd bins.

■Using a mechanical clutch method or an electromagnetic clutch method, the driving force for the feed roller is obtained from the printer's line feed motor.

However, the cases ① and ③ are disadvantageous in terms of cost, and the case ③ places a heavy load on the line feed motor, which is disadvantageous in terms of improving the start speed and line feed accuracy.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cut sheet feeder with a simple structure that allows bin selection to be performed without any trouble using forward and reverse rotation of a step motor.

[Means to solve the problem]

In order to achieve the above object, the present invention includes one step motor and a sweet roller that relays paper to the platen pinch roller, and the forward rotation of the step motor causes the first big roller of one bin to In the two-bin type cut sheet feeder, the feed roller is driven by the feed roller, and the feed roller and the second pick roller of the two bins are driven by the reverse rotation of the step motor. Between the 2nd B and 7 crawlers, [(Paper transport distance from a predetermined Bick roller to the platen pinch roller) = (Paper transport distance from the predetermined Bick roller until the rotation direction of the step motor changes) + ( The configuration is such that a clearance equivalent to the margin) is provided.

[For production]

When feeding paper stored in one bin, the step motor is first rotated in the normal direction. This rotation drives the first picking roller to pick up the paper. When the picked paper reaches the feed roller, the step motor stops briefly and then starts rotating in reverse. As a result, the feed roller is driven and the paper is sent to the platen pinch roller, where the skew is corrected, but at this time the first kick roller does not rotate. Also, 1st. Since the above-mentioned clearance is provided between the second big rollers to allow for the margin, the second big roller does not operate when this step motor reverses, ensuring that paper is fed from the second bin. It can be prevented.

Thereafter, when feeding paper from the second bin, the step motor is reversed. This activates the second pick roller, picks up the paper, and sends it to the feed roller. Thereafter, the step motor rotates normally, the second big roller stops, and the paper is sent to the platen pinch roller by the feed roller.

〔Example〕

The present invention will now be described in detail with reference to FIGS. 1-5.

FIG. 1 is an explanatory view of the structure 1 of the essential parts of the cut sheet feeder of this example, and the same reference numerals are used for the same members as in FIG. 6.

The cut sheet feeder 31 of this example is different from the canted sheet feeder 1 shown in FIG. At the second bump roller, [(paper transport distance from a predetermined pick roller 7 to the platen pinch roller 4) - (paper transport distance from the predetermined pick roller 7 until the rotation direction of the step motor 5 changes) The point is that a clearance θ corresponding to + (margin) is provided. Next, an example of means for providing this clearance θ will be explained with reference to FIG. 2.3.

FIG. 2 is a side view showing the clearance providing means for the second big roller 8, and FIG. 3 is a perspective view showing details of the main part of FIG. 2. In the figure, 32 is the shaft of the pink roller 8. . The gear 20 is integrally equipped with a post 33 and a shaft 32
It is rotatably fitted to the Two fan-shaped notches 34 are symmetrically formed in the boss 33, and a pin 3 is formed in the shaft 32.
5 is press-fitted. The bottle 35 has each notch 3401 surface 34
It is possible to concur with a. Like this, the cutout 34 and the bottle 35
Therefore, a clearance θ is provided in the portion of the big roller 8.

Next, the operation of the cut sheet feeder 31 having such a configuration will be explained.

First, the paper feeding procedure for 1-bin storage paper is shown in Figure 1 (a).
), (b) and the corresponding flowchart in FIG. 4. When feeding paper stored in one bin, the first
As shown in Figure (a), the step motor 5 is rotated in the clockwise direction of the arrow.

Due to this rotation, the second picking roller 8 does not operate, but the first picking roller 7 is driven clockwise to pick up the paper. At this time, the gear 15 idles, and the feed roller 6 is driven via the gears 12, 1.3 to rotate clockwise. When the pink paper reaches the feed roller 6, the sensor detects this and the step motor 5 stops briefly and then starts rotating in reverse as shown in FIG. 1(b). As a result, the feed roller 6 is moved to gear 1.
．． 5.16 (gear 12 is idle), and rotates clockwise to send the paper to the platen pinch roller 4. When the step motor 5 reverses, the second big roller 8
is activated because the clearance θ is provided, 2
Paper is not picked up from the bin. Figure 4 is a flowchart of operations related to Figures 1 (a) and (b) above.
At the bottom right of the figure, a linear representation of the arrangement of the rollers is added. If the step motor 5 rotates in the normal direction at the start of paper feeding from bin 1, it will continue until the sensor 25 detects the paper, but even if the step motor 5 rotates by S3 steps, the sensor 25 will continue to rotate.
If the paper is not detected, an alarm is processed. After the paper is detected, the step motor 5 rotates in steps S, and stops when the paper has been conveyed I length. Thereafter, the step motor 5 reverses to step S2 and stops, but the sheet is sent to the platen chiller by this step motor reversing. Thereafter, the paper is set at the printing start position by a line feed motor that drives the platen and platen pinch roller.

Furthermore, the procedure for feeding paper stored in two bins is shown in Figure 1 (
The following is an explanation using c), (d) and the corresponding flowchart of FIG. When feeding paper stored in two bins, the step motor 5 is reversely rotated in the counterclockwise direction of the arrow, as shown in FIG. 1(c). Due to this rotation, the first picking roller 7 does not operate, but the second picking roller 8 is driven clockwise to pick up the paper.

At this time, the gear 12 idles, and the feed roller 6 is driven via gears 15 and 16 to rotate clockwise. When the picked paper reaches the feed roller 6, the sensor detects this, and the step motor 5 immediately stops and then starts normal rotation as shown in FIG. 1(d). As a result, the feed roller 6 is driven via gears 12 and 13 (the gear 15 is idle), rotates clockwise, and feeds the paper past the platen pinch roller. During normal rotation of the step motor 5, the first pick roller 7 does not operate because of the clearance θ, and paper picks from one bin are not performed. Further, the second pick roller 8 does not operate, and the next paper pick for the second bin is not performed. Figure 5 is a flowchart of the operations related to the first part (C) and (d) mentioned above, and a linear diagram showing the arrangement of each roller is added at the bottom right of the figure. . The reverse rotation of the step motor 5, which occurs when paper feeding from bin 2 starts, is detected by the sensor 25.
This continues until the sensor 25 detects paper, but if the sensor 25 does not detect paper even after rotating by S and 1' steps, an alarm process is performed. The step motor 5 rotates 31' steps after the paper is detected, and stops when the paper has been conveyed by 1.3'. After that, the 2-step motor 5 is
'The step motor rotates in the normal direction and then stops.' This forward rotation of the step motor sends the paper to the platen pinch roller.

Thereafter, the paper is set at the print start position by the line feed motor.

〔Effect of the invention〕

As described above, according to the present invention, restrictions on mounting, etc., can be reduced in a cut sheet feeder having a structure in which bin selection is performed using forward/reverse rotation of the built-in motor. , it is possible to realize a simple structure that prevents the second sheet of the smallest medium from being damaged.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1(a), (b), (c), and (d) show the configuration of the main parts of a cut sheet feeder according to an embodiment of the present invention. Fig. 2 is a side view showing the clearance providing means, Fig. 3 is a perspective view showing details of the main part of Fig. 2, and Fig. 4 is a diagram showing the feeding from one bottle in the embodiment of the present invention. FIG. 5 is an explanatory diagram of paper feeding operation from two bins, and FIG. 6 is a configuration of a conventional cut sheet feeder. In the figure, 4 is a platen pinch roller, 5 is a step motor, 6 is a feed roller, 7 is a first pin roller, and 8 is a second big roller. Figure 2: Perspective view showing details of the main parts of Figure 2: Figure 3: 0

Claims (1)

[Claims] It has one step motor (5) and a feed roller (6) for relaying paper to the platen pinch roller (4). 1 bin's first pick roller (7) and the feed roller (6)
and the second pick roller (8) of the two bins and the feed roller (
In the two-bin cut sheet feeder that drives the first and second pick rollers (7, 8),
) - (Paper transport distance from the predetermined pick roller until the rotation direction of the step motor (5) changes) + (margin)] 2. Bin type cut sheet feeder.