JPS6132777A - Paper feed apparatus of printer - Google Patents

Abstract

PURPOSE:To facilitate the setting of recording paper by making a paper feed roller freely rotatable at the setting time of the recording paper, by making the intermediate wheel of transmission wheel trains, which reach a paper feed roller from a motor, freely slidable in the mount axis direction thereof. CONSTITUTION:The intermediate wheel 14 of transmission wheel trains 12, which are rotated in connection with a paper feed motor 13 and reach gears rotating the paper feed shaft 8 fixing a paper feed roller 7 from the motor 13, is made freely slidable in the mount axis direction thereof. Further, a knob 21 is provided to the paper feed drive shaft 11 rotated by the transmission wheel trains and made freely slidable in the axial direction. This knob 21 is engaged with the intermediate wheel 14 to allow the same to slide. The intermediate wheel 14 is returned by the return spring 18 interposed between the intermediate wheel 14 and a support plate and the disconnection and connection in the transmission to the paper feed gear 19 are performed by the movement of the intermediate wheel 14.

Description

[Detailed description of the invention] (Industrial application field) This publication relates to printer paper feeding devices.

(Prior Art) As an example of a paper feeding device of this type of conventional printer, a pair of plate springs are spot welded to a paper guide, a pinch rotor is held on each of the plate springs, and the pitch row 2 is There is something that presses against the paper feed roller. This example does not have a release mechanism, so to set the recording paper, forcefully insert the recording paper between the paper feed roller and pitch roller, and then rotate the paper feed roller until it reaches the specified position. It feeds the paper to the desired position.

Another example is to rotatably support a pair of pitch rollers on a book shaft, and connect one end of this shaft to a book shaft.
A spring is hooked onto the lever to press the pitch roller against the paper feed roller. In this example, to set the recording paper, the pitch roller is moved away from the paper feed roller by swinging against the metal spring, the recording paper is inserted into the gap between the two rollers, and then the pitch roller is moved away from the paper feed roller. When the lever is returned to its original position, the pitch roller is brought into elastic contact with the paper feed roller, and the paper feed roller rotates to feed the paper to a predetermined position.

(Problems to be Solved by the Invention) In the first conventional example above, the recording paper is not set (
Furthermore, if the paper is inserted at an angle, excessive force is applied to correct the skew, which may damage the paper. Furthermore, in the second example, although it is easy to set the recording paper, the shaft supporting the two pitch rollers is quite long, with a length close to the width of the recording paper, and is connected to one end of the shaft. - Since the left and right pitch rollers press against the paper feed roller with spring force, the paper has the disadvantage that it is difficult to feed the paper in a balanced manner.

Therefore, in this invention, when setting the recording paper, the paper feed roller is set in a state where it can freely rotate, and the recording paper
The purpose is to provide the product easily and at low cost with a simple configuration.

(Means for Solving the Problems) This invention provides a paper feeder that rotates a paper feeder shaft to which a paper feeder 90-ra is fixed from the motor in a paper feeder transmission wheel train that rotates in conjunction with a paper feeder motor. The intermediate wheel in the gear train leading to the gear is mounted so that it can slide freely in the axial direction. A paper feed knob is provided on the filter paper feed 9 drive shaft rotated by the paper feed 9 transmission wheel train, and the paper feed knob is slidable in the axial direction.

The paper feed knob engages with the intermediate wheel to cause it to slide, and a return spring interposed between the intermediate wheel and the support plate causes the intermediate wheel to return to its original position. It is configured to connect and disconnect transmission to gears.

(Function) According to this invention, the paper feed knob is pulled to release the intermediate wheel from being suppressed, and the intermediate wheels 'r, lU are moved by the springs. At this position, the transmission between the intermediate wheel and paper feed gear is 1p*
As a result, the paper feed gear can freely rotate together with the paper feed shaft and the paper feed roller. Therefore, the recording paper can be easily inserted between the paper feed roller and the pitch roller, making it easy to set the recording paper. If you press the paper feed knob,
The intermediate wheel moves against the return spring, allowing transmission to the paper feed gear again.

(Actual Example) As shown in the plan view of the right side of the printer in Fig. 1 (A), support plates 1 are provided facing each other on the left and right with an interval between them, and guide rods 2 are installed thereon.

The print head 6 and ribbon cassette 4 are placed on the carrier while being guided by this guide rod.

A platen 5 (shown in the fourth figure) is mounted on the support plate 1, facing the print head 3. Print head 3 and platen 5
is moved through a transmission line 6 (shown in FIG. 6) for printing, which is provided on the outer surface of the support plate 1.

A paper feed shaft 8 is mounted on the support plate 1 and has a pair of paper feed rollers 7 (the left roller is not shown) fixedly spaced apart from each other. Further, the support plate 1 is provided with a paper feed 9 drive shaft 11 to which a sprocket wheel 9 (the left wheel is not shown) and a friction roller 10 are fixed to both ends. A paper feed transmission wheel train 12 is provided on the outer surface of the support plate 1 as shown in the third figure.

The paper feed transmission gear train 12 will now be described. As shown in the first to third figures, the intermediate wheel 14 rotates in conjunction with the rotation of the pinion 15a of the paper feed motor 15. The intermediate wheel 14 has thick teeth 14a,
The intermediate wheel 14b and pinion gear 14c are integrally formed in six layers, and the mounting protruding from the support plate 1 through the center hole 14 (l) is fitted into the shaft 15 so as to be slidable in the axial direction. are doing.

A degree-setting protrusion 14e is provided at the center of the side surface of the large gear 14a, and the paper feed shimotor 13 can be attached to the plate 16 in abutment. Reference numeral 17 denotes means for fixing the plate 16i to the support plate t at predetermined intervals. A resting spring 18 formed of a leaf spring is interposed between the intermediate wheel 14 and the support plate 1.

For installation, the shaft 15 passes through the center hole of the inferior spring 18,
The tip 18a of the return spring is bifurcated and engaged with the fixing means 17 for positioning. Large gear 14 of intermediate wheel 14
It meshes with the aFi pinion 13a, and the intermediate 114b meshes with the paper feed pawl 19. The end 8a of the paper feed shaft 8 is fitted and fixed in the center hole of the paper feed gear 19, and rotation is transmitted. The small gear 14c meshes with the paper feed drive gear 20.

The end portion 11a of the paper feed drive shaft 11 fits into the center hole of the paper feed drive gear 20, and rotation is transmitted. Paper feed drive shaft 11
A paper feed knob 21 is attached to the end portion 11a. That is, the end portion 11a has a flat surface 11 for making the cross section non-circular.
b is provided, and two click grooves 11C111cl are provided. Attach the end 11a″ to the center hole of the paper feed knob 21.
4, and the protrusion of a click spring 22 attached to the paper feed knob 21 can selectively engage with the click grooves 11C and 11d. The side of the paper feed φ knob 21 is the intermediate wheel 1.
It is possible to engage with the side of 4.

In FIG. 4, paper guides 25 and 24 are installed on the support plate 1, and the recording paper passes through this gap. The paper guide 25.24 has a pair of left and right windows 23a, 24a.
is provided, and the paper feed 90-ra 7 and the pitch roller 25 can come into contact with each other with the recording paper sandwiched therebetween. Reference numeral 26 denotes a pitch roller holding spring which presses against the pitch roller 25 and paper feeder 90-ra 7, and is fixed to the paper guide 24.

When setting the recording paper, when the paper feed knob 21 is pulled to the right as shown in FIG. 1(A), the protrusion of the click spring 22 engages in the click groove 11d and is clicked. As a result, the intermediate wheel 14 is released from the paper feed 9 knob 21 and slides to the right by the spring force of the return spring 18, and the position where the alignment protrusion 14e abuts the plate 16 is the mounting position of the paper feed motor 13. The position is determined by In this position, middle tooth breath 14t
+ is out of mesh with the paper feed gear 19. Therefore, the paper feed gear 19 can rotate freely, and the paper feed shaft 8 and paper feed roller 7 are also free. Therefore, when the recording paper is inserted between the paper feed roller 7 and the pin roller 25 and pushed further, both rollers rotate freely and the recording paper can be fed 9. When the leading edge of the recording paper reaches the front of the sprocket wheel 9 and friction roller 10, the paper can be further fed by rotating the paper feed 9 knob 21. After feeding the recording paper to the desired position, the screen shown in Figure 1 (
If you slide the paper feed knob 21 to the left as shown in B),
The protrusion of the click spring 22 engages in the click groove 11c and is clicked. At this point, the paper feed knob 21 is in the middle!
14, and slides the intermediate wheel to the left against the spring force of the thrust spring 18 as shown in the second figure. As a result, the intermediate gear 14b meshes with the paper feed gear 19 again to transmit rotation. When the paper feed motor 1s is driven in this state, the paper feed gear 19 and the paper feed drive tooth are connected to the transmission wheel train 12. 20 rotate together, paper feed 9 shaft 8, paper feed drive shaft 1
1 rotates in conjunction to feed the recording paper.

(Effects of the Invention) This invention makes it possible for the paper feed 90-ra to freely rotate by cutting off the transmission from the paper feed transmission train when setting the recording paper. Even if it is inserted at an angle, it can be easily corrected to the correct position.It can be provided at low cost with a simple structure without using any extra parts other than the return spring and click spring.

[Brief explanation of drawings]

Figures 1 (A) and 1 (B) are partially cutaway plan views showing the main parts, Figure 2 is an enlarged sectional view taken along the line ii in Figure 3, and Figure 3 is a partially cutaway reduced right side view. FIG. 4 is a reduced sectional view taken along the line ■-■ in FIG. 1. 1...Support plate 7...Paper feed roller 8...Paper feed shaft 11...Paper feed drive shaft 12...Paper feed transmission gear train 16...Paper feed 9 Motor 14 ...Intermediate wheel 15...Mounted on shaft 18...Return spring 19...Paper feed gear 21...Paper feed 9 knobs or more

Claims (1)

[Scope of Claims] A paper feed roller and a pitch roller that are arranged so as to be able to sandwich recording paper and face each other; a paper feed transmission gear train that rotates in conjunction with a paper feed motor to feed the recording paper; A paper feed gear in the transmission gear train for rotating a paper feed shaft to which a paper feed roller is fixed, and a paper feed gear provided in the transmission gear train from the paper feed motor to the paper feed gear, and protruding from the support plate. an intermediate wheel slidably mounted in the axial direction of the mounting shaft provided, a return spring interposed between the support plate and the intermediate wheel, and a paper feed rotationally driven by the transmission wheel train. A paper feed knob is attached to the drive shaft so as to be slidable in the axial direction but non-rotatable, and is engageable with the side surface of the intermediate wheel, and the paper feed knob and the return spring provide
A paper feeding device for a printer, characterized in that the intermediate wheel is moved to a position where transmission to the paper feeding gear is interrupted.