JPS63315449A - Paper sheet feeding device - Google Patents

Abstract

PURPOSE:To make fine adjustment easily by providing a paper sheet feeding device which gives a detention force to a paper sheet feed roller with a clutch section for performing rotary motion interlocked with its reciprocal movement. CONSTITUTION:A clutch 3 is attached to a platen shaft 2 via a journal bearing 2a freely rotatably but not movably in the axial direction. A platen knob 1 with its elongated hole 1b engaging with a boss 2b slides in the direction of the shaft 2. The clutch 3 is provided with a groove 3a having curved surfaces opposing each other in the circumferential direction. A boss 1a of the platen knob 1 is made to engage with the groove 3a. A spring urges the platen knob 1 and the platen shaft to part from each other. If the platen knob 1 is pressed by hand, the boss 1a turns the clutch 3 in the direction of the arrow A. When the hand is released, the boss 1a enters the groove 3b to make the platen knob 1 and the shaft 2 free. This makes the fine adjustment of the platen easy.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a paper feeding device for a recording device.

[Prior Art] Conventionally, in a recording device, a platen knob used for paper feeding is either fixed on the platen shaft or the paper feeding roller shaft, or is detachable from the platen shaft or the paper feeding roller shaft. It took two forms.

There are also devices that have a serration mechanism that allows the platen knob to slide on the platen axis to make fine adjustments to the paper feed, but this mechanism only works while applying force to push or pull the platen knob. Although the position changes, when the force is removed, it returns to the predetermined position due to the biasing force of the spring, so it can be seen that it is ultimately fixed on the platen shaft by the force of the spring.

A recording device that combines these devices to improve paper feeding accuracy by having a detent gear in the paper feeding drive system from the paper feeding drive source to the platen or paper feeding roller, and by hooking a detent lever to the detent gear. In most cases, the force that presses the detent lever against the detent gear is obtained from the biasing force of a spring. There were two forms: and one that separated the detent gear.

The type that separates the detent lever from the detent gear uses an actuator for operating the detent lever, and applies a force counter to the biasing force of the spring to keep the detent lever separated from the detent gear from the start of the paper feeding operation to the end. Most of them continued.

Combining the above-mentioned serration mechanisms - the conventional example is the first
5 and 16.

In FIGS. 15 and 16, 1 is a platen knob;
2 is a platen shaft or a paper feed roller shaft, 5 is a compression spring, and 6 is a coupler pull, which are fixed to the shaft 2 so as not to move in the axial direction or around the shaft. A platen gear 7 is engaged with the shaft 2 so as to be able to slide in the axial direction of the shaft 2 and rotate around the shaft while being regulated by the compression spring 5 . Further, the platen knob 1 is slidably engaged with the shaft 2 and the coupler barrier pull 6 in the axial direction of the shaft 2.

The platen gear 7 and the coupler barrier pull 6 are engaged with each other by the biasing force of the compression spring 5 via their respective serrations 7a and 6a.

A stopper 8 is fixed to the shaft 2. Here,
The serrations 6a and 7a are used to determine minute rotational positions by meshing the serrations with each other.

In normal paper feeding using key power or the like, the detent gear 11 receives driving force from a paper feeding motor (not shown).
Power is transmitted to the platen gear 7 via a gear train indicated by a broken line. Note that the detent gear 11 is equipped with a detent spring 12A.
are meshed together to form a detent mechanism. This power causes the platen gear 7 to rotate, and its serrations 6a and 7a mesh with the serrations 6a of the coupler barrier pull 6, thereby transmitting the rotation to the coupler barrier pull 6. The rotation of the coupler barrier pull 6 is 111
12 and feeds the paper.

In manual paper feeding, the paper is fed by rotating the platen knob 1, but since the platen knob 1 is attached to the coupler barrier pull 6 so that there is no play in the rotation direction, the rotation of the platen knob 1 causes the coupler barrier pull 6 to move. rotates, and this rotation is transmitted to the shaft 2.

By the way, in recording devices such as typewriters, a detent mechanism such as a detent spring 12A is provided in order to improve paper feeding accuracy. It has a lick which makes it possible to fix the position. However, when the format of the recording paper is fixed, it is often impossible to adjust the print position with respect to the squares previously written on the recording paper with the minimum click resolution, that is, the minimum number of lines that can be determined.

Therefore, a serration mechanism is provided to perform fine adjustment. When the platen knob 1 is pushed in as shown in FIG. is left in its original position, and the platen gear 7 is pushed with the tip 1a of the platen knob 1 to release the engagement of the serration mechanism. At the same time, the detent mechanism and 1ld2 become free, and by rotating the platen knob 1, via the coupler barrier pull 6! 1th2 is rotated to determine the paper feed position, and then the position is determined by engaging the serrations as shown in FIG.

[Problems to be Solved by the Invention J However, the above conventional example has the following problems.

The type that separates the detent lever from the detent gear during paper feeding requires a dedicated actuator to separate the detent lever, making it expensive, and furthermore, the paper feeding operation can be stopped from the start of the paper feeding operation. Since the detent lever must be kept separated from the detent gear until the time is reached, the power consumption during that time is large, causing problems such as voltage drop.

Furthermore, in a recording device that has a serration mechanism and makes fine adjustments to the paper feed, as shown in Figures 15 and 16, when making fine adjustments, the platen knob is pressed and rotated, making delicate position adjustments. There was a problem in that it took time.

Therefore, in view of the above-mentioned conventional problems, the purpose of the present invention is to
To provide a paper feeding device that facilitates fine adjustment of paper feeding, which has a serration mechanism and reduces the driving force of an actuator for releasing the latching of a detent lever, or cancels the application of detent force, in a recording device. There is a particular thing.

[Means for Solving the Problems] To this end, the present invention provides reciprocating motion in a paper feeding device that includes a paper feeding roller for feeding recording paper and a detent mechanism that applies detent force to the paper feeding roller. A first member capable of rotating, a second member connected to the first member and capable of rotational movement, and converting the reciprocating movement of the first member into rotational movement of the second member, the first member can be rotated. The paper feed roller is characterized by comprising means for positioning the paper feed roller at a first stable rest position where a detent force is applied to the paper feed roller and a second stable rest position where a detent force is not applied to the paper feed roller.

[Operation J] According to the above configuration, by reciprocating members such as the platen knob and detent lever, it becomes possible to sequentially set a plurality of stable resting positions of these members.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

1 to 7, FIG. 13, and FIG. 14 show a first embodiment of the present invention. In these figures, 1 is a platen knob, and 2 is a platen shaft or a paper feed roller shaft. 3
is a clutch, the cylindrical side surface of which is formed with a groove, and the wall of the groove forms a cam surface. 4 is a device case of a recording device to which this embodiment is applied.

Figures 1 (^) and (6) show platen knob 1. 2 is an external perspective view and a sectional view showing the relative positional relationship of @2 and clutch 3, respectively. In Figure 1, platen knob 1
By engaging the elongated hole 1b and the boss 2b of the shaft 2,
The platen knob 1 is slidable in the axial direction relative to the shaft 2 and transmits rotation of the platen knob 1 to the shaft 2. Also,
The clutch 3 is connected to a metal bearing 2a that pivotally supports the shaft 2,
This allows it to rotate freely around 1d12. Furthermore, a stopper 2c joined to the shaft 2 prevents the clutch 3 from sliding in the axial direction. Furthermore, platen knob 1 and clutch 3
This means that the boss 1a provided on the claw portion of the platen knob 1 fits into the groove portion 3a of the clutch 3, and engages with the compression spring 5 in a compressed state.

2, 4 and 6 are external perspective views for explaining the operation of this example, and FIGS. 3, 5 and 7 are schematic diagrams showing the positional relationship between the device case and the platen knob. It is a diagram. The operation in this example will be described below with reference to FIGS. 2 to 7.

In FIGS. 2, 4, and 6, the platen knob 1 is omitted and only the boss 1a is shown. As shown in FIG. 2, the platen knob 1 is being pushed away from the clutch 3 by the biasing force of the compression spring 5, so when the boss la hits the end 3b of the groove of the clutch 3, the platen knob 1 is moved away from the clutch 3. A first stable position is formed with the clutch 3. At this time, the positional relationship between the platen knob 1 and the device case 4 is such that the platen knob 1 protrudes from the device case 4, as shown in FIG. 3, and is in a suitable position for manual paper feeding operation.

When the platen knob 1 is pushed inward into the device case 4, the boss 1a shown in FIG. 2 comes into contact with the wall of the groove at the position 30 of the clutch 3. The wall has a cam shape, so by pushing the platen knob 1 further, the boss 1
a slides on the wall while in contact with the wall and rotates the clutch 3 in six directions shown by arrows in the figure. The position where the knob 1 is pushed in is the position 3d shown in FIG. 4. The positional relationship between the platen knob 1 and the device case 4 at this time is shown in FIG.

When the force pushing the platen knob 1 is removed, the platen knob 1 moves away from the clutch 3 due to the biasing force of the compression spring 5, and the boss 1a touches the wall of the clutch groove at the position 3e shown in FIG. Contact and rough spring 5
By receiving the urging force, the clutch 3 is moved to the second stable position while being rotated in the direction A shown by the arrow in the figure as described above.

The second stable position is the position 3f shown in FIG. 6, and the positional relationship between the platen knob 1 and the device case 4 at this time is shown in FIG. Platen knob 1 shown in Figures 3 and 7
The difference in the positional relationship between the clutch 3 and the case 4 is the difference in the depth of the first and second stable points in the groove 3a provided in the clutch 3.

When the platen knob 1 is pushed into the case 4 from the state shown in FIG. 7, the state shown in FIG. 5 is returned while rotating the clutch 3 in the same manner as described above, and when the pushing force is removed, the state is again shown in FIG. 3. Return to In this way, two stable positions relative to the case 4 can be taken each time the platen knob 1 is pushed in.

It is of course possible to set two or more stable positions in the pushing direction by appropriately forming the shape of the groove portion 3a.

13 and 14 show a first embodiment of the present invention in which the mechanism shown in FIGS. 1 to 7 is applied to finely adjust paper feed with detent released, and at the same time, FIG. Also, the problems of the conventional example shown in FIG. 16 are solved. In FIGS. 13 and 14, elements similar to those shown in FIGS. 15 and 16 are given the same reference numerals, and their explanations will be omitted.

The configuration differs from the conventional example in that the above-mentioned clutch 3 is provided in place of the stopper 8, and furthermore, the arm portion of the platen knob 1 extends through the platen gear 7, and is engaged with the clutch 3 by its boss IC. It is. With this configuration, the same effect as shown in FIGS. 1 to 7 is realized.

That is, in FIG. 13, the platen gear 7 and the coupler barrier pull 6 are connected by the serrations 6a and 7a and are in a normal paper feeding state, but the platen knob 1
When pushed in, the platen gear 7 is pushed by the shoulder 1b to release the serration connection with the coupler barrier pull 6, and at the same time, the clutch 3 is stabilized in the state shown in FIG. 14 while being rotated by its cam shape. At this time, with the detent mechanism! 1Lh2 is free. As a result, fine adjustment operations for paper feeding do not require pressing the platen knob 1 and can be concentrated only on the amount of rotation, making the operation extremely easy. After the fine adjustment operation is completed, the platen knob is pushed in again to return to the state shown in FIG. 13 and a normal paper feeding operation is performed.

FIGS. 8 to 1θ are side views showing a second embodiment of the present invention. In the figure, 11 is a detent gear related to the rotational drive for paper feeding such as a paper feed roller or a platen roller, 12 is a detent lever that is hooked to the detent gear 11 and sets the paper feeding position, and is rotated by 1liIll15. Freely pivoted. Detent lever 12 is spring 13
A rotational force is obtained by the tensile force of
to hang. 14 is a cam rotatably supported by a glaze 16, and a boss 12 disposed on the detent lever 12.
a is engaged with a groove 14' formed in the cam 14. Note that only a portion of the groove portion 14' is shown in FIGS. 8 to 10.

Further, FIG. 12(A) is a block diagram showing the configuration of a recording apparatus having the apparatus shown in FIGS. 8 to 10.

In the figure, 100 indicates ROM100A and RAM10
0B, which controls the entire recording apparatus, the ROM 100A stores the processing procedure described later in FIG. 12(B), and the RAM 100B is used as a work area for controlling the apparatus.

Reference numeral 101 denotes a keyboard, and key operations on the keyboard 101 perform manual control related to printing and device operations. 102 is a print head, which performs printing based on information entered manually from the keyboard; 103 is a paper feed motor, which is driven by commands from the CPo 100; 1
04 is an actuator, similarly CPII 100
The detent lever 12 is driven based on the control.

The operation in this example will be described below with reference to the flowchart of the processing procedure shown in FIG. 12(B).

First, a printing operation is performed using the keys on the keyboard 101 of the recording device (step 321 in FIG. 12), and then it is determined whether or not to feed the paper (step 522).

For example, if it is determined that printing for one line has been completed and it is time to feed the paper, the process proceeds to the next step and the actuator 10
4, otherwise the process returns to step S21 to continue the printing operation.

Figure 8 shows the detent mechanism in the printing state.
When the actuator 104 (not shown) applies a force to the detent lever 12 in a direction opposite to the tensile force of the spring 13 (step 523), the boss 12a comes into contact with the groove wall 14a of the cam 14, and the cam shape that the wall 14a has Due to the force of the actuator 104, the boss 12a slides while contacting the wall 14a, and the cam 4 is moved to the point indicated by the arrow in the figure.
While rotating in the direction, it moves six times to a predetermined stop position. This is the state shown in FIG.

Next, when actuator 104 is turned off (step 5
24) The detent lever 12 receives a force to rotate in a direction so as to mesh with the detent gear 11 again due to the tensile force of the spring. As a result, the boss 12 of the detent lever 12
a comes into contact with a groove wall 14b provided on the cam 14, and the wall 14
Since b is similarly cam-shaped, the first stable position is reached while rotating the cam 14 in the direction B indicated by the arrow in the figure. This state is shown in Fig. 1θ.

The groove shape of the cam 14 is set so that the beak-shaped tip of the detent lever 12 does not touch the detent gear 11 in the first stable position. If the paper feed operation is performed in this state (step 525), the detent lever 12 and the detent gear 1
Since the paper feed motor 103 does not interfere with each other in any way, the force of the paper feed motor 103 may be minimal for feeding the paper, and no abnormal noise is generated. Furthermore, the actuator 10
Actuator! The 04 itself is small and inexpensive, and can fully demonstrate its power, making it both efficient and economical.

At the end of paper feeding, that is, when the paper feeding motor 103 is turned off (step 526), when the actuator 104 is turned on again (step 527), the boss 1 of the detent lever 12 is turned on.
2a comes into contact with 114c provided on the cam 14, and in the same way as described above, the cam 14 is rotated in the direction C shown by the arrow in the figure to reach a predetermined stop position, where the actuator 1
04 is turned off (step 528), the boss 12a of the detent lever 12 is moved by the cam 14 due to the tensile force of the spring 13.
It reaches the second stable position while abutting against the wall 14d provided on the wall 14d, and returns to the printing state shown in FIG.

In the second embodiment described above, the dedicated actuator 104 was used to rotate the detent lever 12 against the force of the spring 13, but the detent lever 12 can be rotated by using the driving force of the paper feed motor 103. Spring 13
FIG. 11 shows a modification of the second embodiment in which the rotation is performed against the tensile force of .

In FIG. 11, elements similar to those shown in FIGS. 8 to 1O are given the same reference numerals and their explanations are omitted. In FIG. This detent gear is a one-way mechanism that transmits driving force only when rotating in the direction D shown by the arrow in the figure. Reference numeral 17 denotes a release cam, which is rotationally driven by power via a gear portion (not shown). 1
8 and 19 are idler gears that mesh with each other, and the idler gear 18 can only rotate in one direction shown by the arrow in the figure, and meshes with the gear portion of the release cam 17, and the idler gear 19 meshes with the detent gear 11. There is. 20
is a paper feed motor, and a pinion gear 21 is attached to its rotating shaft.
to directly drive the idler gear 19.

When the paper feed motor 20 rotates the pinion gear 21 in the E direction shown by the arrow in the figure, the idler gear 19 rotates in the G direction shown by the arrow in the figure, thereby causing the detent gear 11 to rotate in the D direction shown by the arrow in the figure. Perform paper feed. Idragia 18 is! In this case, the idler gear 18 does not rotate because it is a one-way system that obtains rotational force only in the direction.

On the other hand, when the paper feed motor 20 rotates the pinion gear 21 in the direction F shown by the arrow in the figure, the idler gear 19 rotates in the direction H shown by the arrow in the figure, but at this time the detent gear 11 does not rotate and the idler gear 1B Since it rotates in one direction, power is transmitted to a gear portion (not shown) of the release cam 17, and the release cam 17 rotates in the J direction indicated by the arrow in the figure.

Due to this rotation, the boss 17a of the release cam 17 comes into contact with the left side wall 12c of the hole wall provided in the detent lever 12, and exerts the same effect on the detent lever 12 as the actuator 104 shown in the second embodiment.

The operation in this example will be explained with reference to FIGS. 8 to 1O. That is, the release cam 1 is moved from the state shown in FIG.
7 in the J direction, the boss 17a becomes M 12 c
The detent gear 11. exerts an action on the detent lever 12 to resist the tensile force of the spring 13. The positional relationship between the lever 12 and the cam 14 is as shown in FIG. Thereafter, when the release cam 17 further rotates in the J direction to complete one rotation and the boss 17a returns to the position shown in FIG. 11, the above positional relationship becomes the first stable position shown in FIG. 1O. Further, by one rotation of the release cam 17 in the J direction, the above positional relationship becomes the second stable position shown in FIG.

[Effects of the Invention] As is clear from the above description, by reciprocating members such as the platen knob and detent lever, it is possible to sequentially set a plurality of stable resting positions of these members.

As a result, only a small amount of drive energy is required to release the detent lever, so that the actuator for releasing the lock can be made smaller and the actuator m can also be used for other purposes.

Furthermore, when making fine adjustments to the paper feed, the user can concentrate on the adjustment itself, which has the effect of improving the operability of the fine adjustments.

[Brief explanation of drawings]

1A and 1B are an external perspective view and a sectional view, respectively, of a mechanism according to a first embodiment of the present invention, and FIGS.
The figure is an explanatory diagram for explaining the operation of the mechanism shown in Fig. 1, Figs. 8 to 10 are side views showing the second embodiment of the present invention, and Fig. 11 is a side view of the second embodiment of the present invention. FIG. 12(A) is a block diagram showing the configuration of a recording apparatus having the device shown in FIGS. 8 to 10, and FIG. 12(B) is a side view showing a modified example. FIGS. 13 and 14 are sectional views showing the first embodiment of the present invention, and FIGS. 15 and 16 are sectional views of a conventional device using a serration mechanism. . DESCRIPTION OF SYMBOLS 1...Platen knob, 2...Shaft, 3...Clutch, 4...Device case, 5...Compression spring, 6...Detent barrier pull, 7...Platen gear, 8... Stopper, 11... Detent gear, 12... Detent lever, 13... Spring, 14... Cam, 15, 16... Shaft, 17... Release cam, 18, 19... Idler gear , 20...Paper feed motor 103. 21...pinion gear, 100...cpu. 100 A...ROM. 100B...RAM. 101...Keyboard, 102...Print head, 103...Paper feed motor, 104...Actuator. Figure 12 (A) Flowchart of Actual Power A-F Figure 12 (B) L ---] Figure 13 Cross-sectional view of an example of forfeiture of power Figure 14

Claims (1)

[Scope of Claims] 1) In a paper feeding device including a paper feeding roller for feeding recording paper and a detent mechanism for applying a detent force to the paper feeding roller, a first member capable of reciprocating motion; , a second member that is coupled to the first member and capable of performing rotational movement; and converting the reciprocating movement of the first member into rotational movement of the second member, the detent force is applied to the first member. a first stable stationary position where the detent force is applied to the paper feed roller; and a second stable rest position where the detent force is not applied to the paper feed roller.
and means for positioning the paper in a stable stationary position. 2) In the paper feeding device according to claim 1,
The second member has a cylindrical member whose longitudinal direction is the axis of rotation, the first member is capable of reciprocating motion in the axial direction, and the means includes a spring that biases the first member in the backward direction. a member, a side surface that rotates the cylindrical member with the forward movement of the first member, a side surface that prevents the cylindrical member from rotating by more than the predetermined amount after the predetermined amount of rotation, and a backward movement of the first member by the spring member. A paper feeding device characterized in that the cylindrical member has a groove portion provided with a side surface for rotating the cylindrical member and a side surface for preventing the cylindrical member from rotating more than the predetermined amount after the predetermined amount of rotation has been completed. 3) In the paper feeding device according to claim 1,
The second member has a planar member perpendicular to the axis of rotation, the first member is capable of reciprocating within a plane perpendicular to the axis, and the means moves the first member in a backward direction. A spring member that biases, a side surface that rotates the planar member with the forward movement of the first member, a side surface that prevents the planar member from rotating by more than the predetermined amount after the predetermined amount of rotation, and the first member that is caused by the spring member. A paper feeding device characterized by having a side surface that rotates the planar member as the member returns, and a groove portion of the planar member that has a side surface that prevents the planar member from rotating by more than the predetermined amount after the predetermined amount of rotation. .