JPH0295659A - Paper sheet return quantity control method for printing paper sheet - Google Patents

Abstract

PURPOSE:To adjust freely the paper sheet return quantity by performing the reverse rotation of a platen roller from the engagement of a counter gear with a reverse gear up to the reverse rotation of the counter gear by the suction interaction generated among the gears. CONSTITUTION:When the tip of a counter arm comes in contact with a projecting part 11b, a counter arm 9 is rotated and a counter gear 10 becomes engaged with a reverse gear 1 so that the rotation of a driving gear 8 is transmitted to the reverse gear 1, a platen roller is reversely rotated, and thereby the paper sheet return of printing paper sheet starts. If the driving gear 8 is continuously rotated, the counter arm 9 remains in the same state by its rotating force, and if the counter gear 10 and the reverse gear 1 are rotated in the state of being once engaged, the reverse rotation of the platen roller continues in the engaged state by the suction interaction among the gears. When the rotation of a motor is slightly reversed after the fixed quantity of paper return, the driving gear 8 and the counter gear 10 are also rotated reversely, the suction interaction becomes extinct, the counter gear 10 is separated from the reverse gear 1, and the reverse rotation of the platen roller is stopped, so that the paper sheet return of the printing paper sheet is terminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for controlling the amount of return of printing paper in a facsimile machine or the like.

(Prior Art) When printing on paper, it is necessary to keep the amount of the beginning of the paper constant in order to align the first printing position on the paper.

Therefore, it is necessary to rewind the paper that has come out too far, and rewinding the paper has been practiced in the past, and will be explained below with reference to the drawings.

FIGS. 2 (1), (2), and (3) are side views of essential parts of the drive mechanism, and in the figures, 1 is a reversing gear connected to a platen roller (not shown).

Reference numeral 2 denotes a motor pulley, which interlocks with an idle pulley 4 via a belt 3. An idle gear 5 is integrated with the idle pulley 4, and a cam gear 6 is driven by gear transmission from the idle gear 5. This cam gear 6
The cam 7 is integrated into the cam 7.

A drive gear 8 is provided integrally with the idle pulley 4, and a counter arm 9 is coaxially attached to the drive gear 8, and is biased by a spring (not shown) so that its tip comes into contact with the cam 7. has been done. A counter gear 10 is rotatably attached to the rear end of the counter arm 9, meshes with the drive gear 8, and is disposed opposite the reverse gear 1.

According to the above configuration, the power from the motor pulley 2 is transmitted to the idle pulley 4, and the power is transmitted to the cam gear 6 via the idle gear 5, causing the cam 7 to rotate in the direction of the arrow.

When the cam 7 rotates in the direction of the arrow, the counter arm 9 pressed against the cam 7 moves as shown in FIG.
It acts in the order of 1), (2), and (3).

In FIG. 2(1), the tip of the counter arm 9 is in contact with the trough 7a of the cam 7, so the counter gear 10 is not engaged with the reverse gear 1.

When the cam 7 rotates and the tip of the counter arm 9 comes into contact with the peak 7b, the counter arm 9 rotates and the position shown in FIG. 2 (2) occurs.
In this state, the counter gear 10 meshes with the reverse gear 1, transmits the rotation of the drive gear 8 to the reverse gear 1, and reversely rotates the platen roller (not shown). Therefore, the reverse gear 1 can be driven only between the peaks 7b to reversely rotate the platen roller, thereby returning the printing paper.

Further, the cam 7 rotates and the counter arm 9 moves from the peak 7b.
When the tip of the counter arm 9 comes off, the tip of the counter arm 9 is immediately moved to the cam 7 by the optical force of the spring as shown in Fig. 2 (3).
Accordingly, the counter gear 10 is separated from the reverse gear 1, and the rotation of the drive gear 8 is no longer transmitted to the reverse gear 1, the reverse rotation of the platen roller is stopped, and the return of the printing paper is completed.

[Problem to be solved by the invention]

According to the above-mentioned conventional technology, since the platen roller rotates in the opposite direction only between the peaks of the cam, the return amount of the printing paper is fixed and cannot be changed, so the printing position must always be aligned. There are some problems that make it difficult.

[Means for Solving the Problems] The present invention rotates a cam from a motor pulley via a gear, provides a counter gear on the other side of a counter arm whose one end abuts the cam, and rotates the counter arm by the movement of the counter arm by the cam. A reversing gear that engages and separates the gear is connected to a platen roller that feeds the paper, and the reversing gear is rotated and stopped by engaging and separating the counter gear, causing the platen roller to rotate in the reverse direction and returning the paper. In the paper return amount control method for printing paper described above, when the counter arm is driven by a cam and the counter gear meshes with the reverse gear, and once the rotation of the counter gear is transmitted to the reverse gear, the suction action generated between the two gears causes It is characterized in that rotation transmission continues until reverse rotation is applied to the counter gear.

[Function] According to the above configuration, rotation transmission is continued until reverse rotation is given to the counter gear due to the suction action generated between the gears. This means that the platen roller can be rotated in the opposite direction for an arbitrary period of time until it is rotated in the opposite direction, and the amount of paper returned can be freely adjusted.

[Example] An example of the present invention will be described below with reference to the drawings. Note that parts that are the same as those in the prior art described above will be described using the same reference numerals.

Figures 1 (1), (2), (3), (4) and (5) are side views of the main parts of the drive mechanism, and in the figures, 1 is a reversing gear connected to a platen roller (not shown). be.

Reference numeral 2 denotes a motor pulley, which interlocks with an idle pulley 4 via a belt 3. An idle gear 5 is integrated with the idle pulley 4, and a cam gear 6 is driven by gear transmission from the idle gear 5. A cam 11 is integrated with this cam gear 6.

Reference numeral 8 denotes a drive gear that is integrally provided with the idle pulley 4. A counter arm 9 is coaxially attached to the drive gear 8, and a counter gear 10 is rotatably attached to the rear end of the counter arm 9. It is in mesh with the drive gear 8 and is disposed opposite to the reversing gear 1.

According to the above configuration, the power from the motor pulley 2 is transmitted to the idle boolean I74, and the power is transmitted to the idle gear 5.
is transmitted to the cam gear 6 via the cam 11 to rotate in the direction of the arrow.

When the cam 11 rotates in the direction of the arrow, the counter arm 9 in contact with the cam 11 moves as shown in FIG.
It acts in the order of 1), (2), (3), (4), and (5).

In FIG. 1(1), the tip of the counter arm 9 is in contact with the trough 11a of the cam 11, so the counter gear 10 is not engaged with the reverse gear 1.

When the cam 11 rotates and the tip of the counter arm 9 comes into contact with the peak 11b, the counter arm 9 is moved by the peak 11b.
rotates and becomes the state shown in Fig. 1 (2), and the counter gear 1
0 meshes with the reverse gear 1, transmits the rotation of the drive gear 8 to the reverse gear 1, reversely rotates a platen roller (not shown), and starts returning the printing paper.

Furthermore, when the rotation of the drive gear 8 continues, the counter arm 9 continues to remain in that state due to the rotational force of the drive gear 8, and once the counter gear 10 and the reversing gear 1 rotate while meshing, the first
As shown in FIG. 3, the counter gear 10 is engaged with the reverse gear 1, and the platen roller continues to rotate in the reverse direction, and the printing paper is returned.

When the motor is slightly reversely rotated after the printing paper has been returned by a predetermined amount, the drive gear 8 and counter gear 10 also rotate in the reverse direction, and the suction action disappears, causing the tip of the counter arm 9 to Immediately, the counter gear 10 comes into contact with the trough 11a of the cam 11, and as shown in FIG. 1(4), the counter gear 10 separates from the reverse rotation gear 1, thereby stopping the reverse rotation of the platen roller and completing the return of the printing paper.

In this state, even if the motor is rotated in the forward direction again, the counter arm 9 will not return to the away direction as shown in FIG. 1 (5), and since the counter gear 10 is separated from the reverse gear 1, 1 remains stopped.

Therefore, the counter arm 9 is raised by the peak 11b of the cam 11, the counter gear 10 meshes with the reverse gear 1, the motor rotates in the opposite direction, and the reverse gear 1 is driven only until the counter arm 9 comes into contact with the valley. The platen roller can then be rotated in the reverse direction, thereby returning a predetermined amount of printing paper. Depending on the timing of this motor's reverse rotation, any desired amount of printing paper can be returned. It will be possible.

〔Effect of the invention〕

According to the present invention described in detail above, a cam is rotated from a motor pulley via a gear, a counter gear is provided on the other side of a counter arm whose one end abuts the cam, and the movement of the counter arm by the cam causes contact between the counter gear and the cam. Printing in which a reversing gear that performs separation is connected to a platen roller that feeds paper, and the reversing gear is rotated or stopped by approaching and separating the counter gear, causing the platen roller to rotate in the reverse direction and returning the paper. In the paper return amount control method, when the counter arm is driven by a cam and the counter gear meshes with the reverse gear, and once the rotation of the counter gear is transmitted to the reverse gear, the suction generated between the two gears causes the counter gear to By continuing to transmit the rotation until the reverse rotation is applied, the platen roller can be rotated in the reverse direction only for an arbitrary period of time, which has the effect of allowing the amount of paper returned to be freely adjusted. .

[Brief explanation of the drawing]

Fig. 1 (1), (2), (3), (4) and (5) are side views of the main parts of the drive mechanism, Fig. 2 (1), (2) and (
3) is a side view of main parts of a conventional drive mechanism. 1... Reverse gear 2... Motor pulley, idle pulley, idle gear, cam gear, drive gear, counter arm, counter gear, cam

Claims (1)

[Claims] 1. A cam is rotated from a motor pulley via a gear, and a counter gear is provided on the other side of a counter arm whose one end is in contact with the cam, and the movement of the counter arm by the cam causes the counter gear to approach and separate. A reversing gear for printing paper is connected to a platen roller that feeds the paper, and the reversing gear is rotated or stopped by the contact and separation of the counter gear, and the platen roller is rotated in the reverse direction to return the paper. In the paper return amount control method, the counter arm is driven by a cam, the counter gear meshes with the reverse gear, and once the rotation of the counter gear is transmitted to the reverse gear, the suction generated between the two gears causes the counter gear to move in the opposite direction. A method for controlling the paper return amount of printing paper, characterized in that rotation transmission is continued until rotation is applied, so that reverse rotation of a platen roller can be performed only for an arbitrary period of time.