JPH0638691Y2 - Paper feed switching mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to improvement of a paper feed switching mechanism suitable for paper feed switching in a printer including a continuous paper feeding tractor, for example.

[Technical background of the invention and its problems] Conventionally, as shown in FIGS. 3 and 4, a motor gear (1) directly connected to a printer drive source is provided in a tractor device attached to a printer for feeding continuous paper. ) Is transmitted to the platen gear (4) coaxial with the platen roller (3) through the idle gear (2), and the tractor gear (6) forming a part of the tractor device (5) is connected to the idle gear. A pulling method (see FIG. 3) for feeding the continuous paper (P) wound around the platen roller (3) by meshing with the (2), and the tractor gear (6).
By engaging the motor gear (1) with the motor gear (1), it is possible to perform two types of paper feeding by feeding the continuous paper (P) to the platen roller (3) and winding it. There is.

For example, when the paper feed is switched from the pulling system to the feeding system, the tractor device (5) is rotated counterclockwise around the point A shown in FIG. 3 as a fulcrum to engage the idle gear (2). When the gear (6) is to be meshed with the motor gear (1), the tractor gear (6) is deeply meshed with the idle gear (2) and cannot rotate.
Therefore, when switching the paper feeding system, the tractor device (5) is removed, the gear that meshes with the tractor gear (6), that is, the motor gear (1) is meshed with the tractor gear (6), and then the tractor device (5) is fixed. Therefore, there is a drawback that the paper feed switching operation is troublesome.

[Purpose of device]

The present invention has been made based on the above circumstances, and in a tractor device that performs two types of paper feeding of a pulling type and a feeding type with the same tractor device, a paper feeding switching mechanism that can easily switch the paper feeding. The purpose is to provide.

[Outline of device]

In order to achieve the above-mentioned object, the present invention provides, in a printer device, a motor gear that drives and rotates in one direction, an idle gear that meshes with the motor gear and rotates, a tractor device that guides and conveys continuous paper, and a tractor device. Drive shaft, a tractor gear that is mounted on the drive shaft and can mesh with the motor gear or the idle gear, a support shaft that supports the tractor device, and a support shaft that presses the support shaft to make the tractor device elastic. Provided on the frame of the printer device, and a first guide portion provided on the frame of the printer device for movably holding the drive shaft to guide and position the tractor device. Second holding the support shaft movably
A guide portion, a long hole penetrating and holding the drive shaft, and a protrusion that slidably contacts the outer periphery of the support shaft are formed, and a rotatable switching lever that switches the tractor gear so as to mesh with the motor gear or the idle gear. And when the switching lever is rotated,
The drive shaft is guided by the first guide portion and the position of the tractor device is changed to change the feeding direction of the continuous sheet by the protrusion moving over the support shaft moving along the second guide portion. It is characterized by doing so.

[Example of device]

Hereinafter, description will be given based on an embodiment shown in FIGS. 1 and 2 of the present invention. FIG. 1 is a side view showing a state in which a continuous sheet is guided from a platen roller to a tractor device and fed out by this mechanism, and FIG. 2 is a continuous sheet being guided by a tractor device to be wound around a platen roller by this mechanism. It is a side view which shows a state.

In FIGS. 1 and 2, (11) is a motor gear directly connected to a motor of a printer device (not shown), and this motor gear (11) is fitted on the shaft of the platen roller (13) via an idle gear (12). It meshes with the mounted platen gear (14).

On the other hand, (16) is a tractor gear fitted to the drive shaft (17) of the tractor device (15), and the tractor gear (16) is arranged so as to mesh with the idle gear (12). ) Is a support shaft that penetrates and supports the tractor device (15). The tractor device (15) is provided in a frame (not shown) of the printer device, and the drive shaft (19) is formed by a first guide part (19) communicating with the recesses (19a), (19b) in a U-shape. While the bearing (17a) of 17) is movably held along the first guide part (19), the support shaft (1) is formed by the second guide part (20) formed of the recess (20a) of the long hole.
8) is movably held along the second guide portion (20).

Further, (21) is a paper feed switching lever which is provided above the tractor device (15) and is rotatable around a fulcrum (C). The paper feed switching lever (21) has the drive shaft (17). The elongated hole (22) for penetrating and holding the bearing (17a) and the protrusion (23) for sliding contact with the outer periphery of the support shaft (18) are formed.

Further, (24) is provided on the opposite side of the switching lever (21) with respect to the support shaft (18), and an elastic member for biasing in the direction of arrow B, for example, a leaf spring, (P) is the tractor device. It is continuous paper sent by (15).

Next, the operation of the present invention based on the above configuration will be described.
In FIG. 1, the tractor device (15) has a bearing (17a) of a drive shaft (17) engaged with a first guide part (19) and a support shaft (18) engaged with a second guide part (20). Is guided and the leaf spring (24) of the elastic member press-contacts the support shaft (18) in the direction of the arrow B, so that the bearing (17a) of the drive shaft (17) moves to the first guide portion (19). The tractor gear (16) is positioned by engaging with the recess (19a) and the idle gear (1).
2) mesh with. Therefore, when the motor gear (11) is driven and rotated in the clockwise direction indicated by the arrow, the driving force is transmitted to the tractor gear (16) through the idle gear (12), and the tractor gear (16) rotates in the clockwise direction indicated by the arrow. The continuous paper (P) wound around the platen roller (13) is sent in the direction of arrow F by the tractor device (15).

Next, when the switching lever (21) is rotated in the direction of the arrow D, the protrusion (2) of the switching lever (21) as shown in FIG.
3) against the tension of the leaf spring (24) and the support shaft (1
8) slide on and reach the top of the protrusion (23).

Then, the support shaft (18) of the tractor device (15)
Is a concave portion (20) of the second guide portion (20) provided on the frame.
The bearing (17a) of the drive shaft (17) separates from the recess (19a) also provided in the frame and moves toward the recess (19b) while being guided by a) and moving in the direction of arrow E. At this time, the entire tractor device (15) moves in the direction of arrow E, so that the tractor gear (16) is disengaged from the idle gear (12).

Therefore, when the protrusion (23) passes over the support shaft (18) by further rotating the switching lever (21) in the direction of the arrow D, the support shaft (18) receives the tension of the spring (24) to move to the second position. The bearing (17a) of the drive shaft (17) returns from the original position of the guide portion (20) to the (19a) recess (19a) of the first guide portion (19).
Positioned by engaging b). At this time, the tractor gear (16) meshes with the motor gear (11), and the rotation of the motor gear (11) causes the tractor gear (16) to rotate counterclockwise as indicated by the arrow opposite to FIG. Therefore, the continuous paper (P) delivered from the platen roller (13) by the tractor device (15) can be delivered from the tractor device (15) along the platen roller (13) in the direction of arrow G.

[Effect of device]

As described above, according to the present invention, in the paper feed tractor device capable of feeding and feeding continuous paper by the same tractor by using the motor gear and idle gear of the printer device, the paper can be easily fed without removing the tractor. This has an excellent effect that the feeding can be switched.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention.
FIG. 1 is a side view showing a state in which continuous paper wound around a platen roller is fed out by a tractor device, and FIG. 2 is a side view showing a state in which continuous paper is fed through a tractor device and wound around a platen roller. FIGS. 3 and 4 show a conventional paper feed switching mechanism. FIG. 3 is a side view showing a state in which continuous paper wound around a platen roller is fed out by a tractor device, and FIG. FIG. 6 is a side view showing a state in which continuous paper is fed from the tractor device and wound around a platen roller. P ... Continuous paper, 11 ... Motor gear 12 ... Idle gear, 13 ... Platen roller 14 ... Platen gear, 15 ... Tractor device 16 ... Tractor gear, 19 ... First guide part 20 ... Second guide part 21 ... Paper feed switching lever (switching lever) ) 24 ... Leaf spring (elastic member)

Claims (1)

[Scope of utility model registration request] 1. A printer apparatus comprising: a motor gear that rotates in one direction; an idle gear that meshes with the motor gear to rotate; a tractor device that guides and conveys continuous paper; and a drive shaft that drives the tractor device. A tractor gear axially mounted on the drive shaft and capable of meshing with the motor gear or the idle gear, and a support shaft supporting the tractor device,
An elastic member for pressing the support shaft to elastically fix the tractor device, and a first guide portion provided on a frame of the printer device for movably holding the drive shaft to guide and position the tractor device. And a second guide portion provided on a frame of the printer device for movably holding the support shaft, a long hole penetrating and holding the drive shaft, and a protrusion for slidingly contacting the outer periphery of the support shaft. And a rotatable switching lever that switches the tractor gear so as to mesh with the motor gear or the idle gear,
When the switching lever is rotated, the protrusion is moved to the second
By passing over the support shaft that moves along the guide portion, the drive shaft is guided by the first guide portion to change the position of the tractor device and change the feeding direction of continuous paper. Paper feed switching mechanism.