JPS62152876A - Paper-feeding mechanism - Google Patents

Abstract

PURPOSE:To automatically feed a paper in each of friction feeding, tractor feeding and auto-loading, by driving a driving element on the basis of a signal from a release lever SW and a signal from a paper end SW. CONSTITUTION:An arm 12 is fixed as one body with a paper pan 4, and a plunger 14 of a latch-type solenoid 13 as a driving element is connected to a tip part of the arm 12. A release lever SW 20 for detecting whether or not the paper pan 4 is released through detecting the displacement of the arm 12 is provided at a position proximate to the arm 12. Further, a paper end SW 22 for detecting whether or not a printing paper 21 is fed to a predetermined position is fitted to the paper pan 4. Switching from one of friction feeding, tractor feeding and auto-loading to another is automatically performed on signals from the release lever SW 20 and the paper end SW 22.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a paper feeding mechanism used in printers and the like.

BACKGROUND OF THE INVENTION Conventionally, paper feeding mechanisms in printers and the like have generally been equipped with a feed roller that is driven to rotate around an axis, and a plurality of pinch rollers and pail rollers that elastically move toward and away from the feed roller. It is.

First, a plurality of pinch rollers are brought into contact with or separated from the feed roller at the same time. Therefore, these pinch rollers are integrally connected by a shaft, and this shaft is moved by a solenoid, a motor, or manually. This causes the pinch roller to approach and separate from the feed roller.

Furthermore, during tractor feeding, the pail roller must be separated from the feed roller, and a paper pail lever is required to move the pail roller toward and away from the feed roller. Therefore, a paper pail lever that moves the pail roller toward and away from the feed roller, a release lever that moves the pinch roller toward and away from the feed roller, and the like are required.

There are also paper pans with multiple pinch rollers attached.

Problems to be Solved by the Invention A plurality of pinch rollers are integrally connected by a shaft, the pinch rollers are brought into contact with and separated from the feed roller by a solenoid or manually, and the pail roller is connected to the feed roller by operating a paper pail lever. The paper feeding mechanism that moves toward and away from the paper has the disadvantage that it increases the number of parts, increases weight, and increases cost. Further, a paper feeding mechanism in which a pinch roller is attached to a paper pan has a disadvantage in that the pressing force of the pinch roller against the feed roller varies due to errors in the dimensions of the parts of the paper pan, causing the printing paper to meander.

The present invention has been made in view of the above points, and provides a trailing paper feeding mechanism that has a simplified structure and weight reduction, and also automates paper feeding during friction feed, tractor feed, and autoloading. The purpose is to

Means for Solving the Problems A paper pan that can freely move toward and away from the paper feeder is provided, and a plurality of pinch rollers elastically biased toward the paper feeder by a biasing member are installed. Attach to paper pan. A release lever Sw for detecting the position of the paper pan and a paper end Sw for detecting the presence or absence of printing paper at a predetermined position are provided. A driving body is provided for moving the paper pan between a position where the pinch roller contacts the paper feeder and a position where the pinch roller separates from the paper feeder based on a signal from the release lever SW and a signal from the paper end SW.

The drive body is driven based on the signal from the action release lever SW and the signal from the paper end SW, the paper pan is moved, and the pinch roller approaches and separates from the paper feed body. Paper feeding is performed automatically during friction feed, tractor feed, and autoloading.

Example An embodiment of the present invention will be described based on the drawings.

First, there are provided a rear feed roller 1, a paper feeder, a rear feed roller 1, a front feed roller 2, and a feed roller 3, which are paper feeders, each having parallel axes and rotatable around the axes. Next, a paper pan 4 is provided which is an integrated paper pan for front feed and a paper pan for rear feed, and this paper pan 4 is supported rotatably around the axis of a support shaft 5. The paper pan 4 has a holder 7 which is biased in the direction of the rear feed roller 1 and the front feed roller 2 by a spring 6 which is a biasing member.
A plurality of pinch rollers 8 are attached to each holder 7 along the axial direction, and a pinch roller 8 that comes into contact with the rear feed roller 1 and a pinch roller 9 that comes into contact with the front feed roller 2 are attached to each holder 7. The holder 7 is attached to the paper pan 4 by engaging the guide boss 10 of the holder 7 with a groove 11 formed in the paper pan 4 so as to be movable in the vertical direction, as shown in FIG. It is being done.

Next, an arm 12 is integrally fixed to the paper pan 4, and a plunger 14 of a latch type solenoid 13, which is a driving body, is connected to the tip of the arm 12. Note that this latch type solenoid 13 can be operated by protruding the plunger 14 to control the pinch rollers 8 and 9.
a contact side coil that contacts the feed rollers 1 and 2;
By retracting the plunger 14, the pinch roller 8
9 away from the feed rollers 1 and 2. Further, a spring 15 is connected to the tip of the arm 12 for biasing the arm 12 and the paper pan 4 clockwise around the axis of the support shaft 5. Further, a release lever 1G is fixed to the paper pan 4 to manually rotate the paper pan 4 about the axis of the support shaft 5. Further, a pair of left and right arms 17 extending upward is fixed to the paper pan 4, and the feed roller 3 is disposed between the upper ends of these arms 17.
A pail roller 18 that comes into contact with is supported. A tractor 19 used for tractor feeding is arranged above the feed roller 3.

A release lever 5W20 is provided near the arm 12 to detect whether the paper pan 4 is released by detecting the displacement of the arm 12. Further, a paper end 5W22 is attached to the paper pan 4 to detect whether or not the printing paper 21 is being fed to a predetermined position.

In such a configuration, when the contact side coil of the solenoid 13 is energized and the plunger 14 is made to protrude, the arm 12 and the paper pan 4 rotate around the support shaft 5, and the first
As shown in the figure, pinch rollers 8 and 9 are brought into contact with feed rollers 1 and 2, and pail roller 18 is brought into contact with feed roller 3. Printing is then performed using friction feed. Note that even if the current is cut off thereafter, the plunger 14 is latched and the first @ state is maintained. Further, the holding force for latching is set larger than the urging force of the spring 15.

Next, when the coil on the decoupling side of the solenoid 13 is energized,
As shown in FIG. 2, plunger 14 is retracted and arm 12. The paper pan 4 and the arm 17 rotate around the axis of the support shaft 5 in the direction indicated by the arrow. Then, the paper pan 4 enters the released state, the pinch rollers 8 and 9 separate from the feed roller 1.2, and the pail roller 18
is opposite from the feed roller 3. And tractor 1
9, normal feed printing is performed. Note that at this time, the release lever 5W20 detects that the paper pan 4 has been released.

Here, the paper pan 4 has a front feed portion and a rear feed portion integrated, which reduces the number of parts. Further, the pinch rollers 8, 9 are attached to the paper pan 4, and parts such as shafts for supporting the plurality of pinch rollers 8, 9 and moving them integrally are not required. The pinch rollers 8 and 9 are urged by the spring 6 and are brought into contact with the feed rollers 1 and 2, so that even if the dimensional accuracy of the paper pan 4 is low, each pinch roller 8.9
The contact pressure becomes approximately equal, and meandering of the printing paper 21 is prevented.

Furthermore, when switching from friction feed to tractor feed, the pinch rollers 8 and 9 are separated from the feed rollers 1 and 2, and the pail roller 18 is separated from the feed roller 3. -Can be done simultaneously by individuals. Further, switching can also be performed manually by operating the release lever 19.

Next, as shown in the flowchart of Figure 4,
Switching between friction feed, tractor feed, and autoloading is automatically performed by signals from the release lever 5W20 and paper end 5W22. Paper feeding operations during friction feed, tractor feed, and autoloading are shown in the table below.

Table 1 For friction feed Table 2 For tractor feed Table 3 For autoloading Note that in this embodiment, one end of the spring 6 is attached to a fixed member, but as shown in FIG. may be attached to the paper pan 4.

Further, in this embodiment, the paper pan 4 is rotated around the support shaft 5 by the driving force of the solenoid 13, but as shown in FIG.
The pinch roller 8 may be moved toward and away from the feed roller 1 by sliding with the driving force of the feed roller 1 .

Effects of the Invention In the present invention, by attaching the pinch roller to the paper pan as described above, the number of parts and weight can be reduced, and the release lever SW for detecting the release state of the paper pan can be The driving body is driven based on the signal and the signal from the paper end SW that detects the presence or absence of printing paper, and paper feeding can be performed automatically during friction feed, tractor feed, and autoloading. have an effect.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view showing the pinch roller in contact with the feed roller, and FIG. 2 is a side view showing the pinch roller separated from the feed roller. , Figure 3 is a perspective view showing how the pinch roller is attached to the paper pan, and Figure 4 is V! A is a flowchart showing a paper feeding state, and FIG. 5 is a side view showing a modification of this embodiment. FIG. 6 is a side view showing another modification of this embodiment. 1... Rear feed roller (paper feeder), 2... Front feed roller (paper feeder), 4... Paper pan, 6... Spring (biasing member), 8.9...
Pinch roller, 13... solenoid (yjA moving body),
20...Release lever SW, 21...Printing paper,
22... Paper end SW Applicant: Tokyo Electric Co., Ltd., y35 diagram, %6 Mother

Claims (1)

[Claims] A paper pan that can freely move toward and away from a paper feeder that is rotatable around an axis is provided, and a plurality of pinch rollers are attached to this paper pan that can be rotated around the axis and elastically moved in the direction of the paper feeder. a release lever SW that is attached via a biasing member that biases the paper pan, and a release lever SW that detects the position of the paper pan and a paper end SW that detects whether or not the printing paper fed by the paper feeder is at a predetermined position; The signal from the release lever SW and the paper end SW
The paper feeding mechanism is characterized in that it is provided with a drive body that moves the paper pan between a position where the pinch roller contacts the paper feeder and a position where the pinch roller separates from the paper feeder based on a signal from the paper feeder.