JPS62116452A - Paper feed device - Google Patents

Abstract

PURPOSE:To eliminate the need for strictness for adjusting the position of the supporting point for respective parts, by integraly providing a positioning unit with a recording head and positioning a feed roller based on the positioning unit. CONSTITUTION:A slit 5a is formed at the tip portion of an arm 5 and the shaft 6 of a feed roller 3 is inserted into the slit 5. In addition, a pin 10 is mounted at the side near to the root of the arm 5 and a spring 11 is disposed between the pin 10 and the shaft 6 so that the feed roller 3 is pulled toward the root side of the arm 5 at all times. The recording head 4 has a positioning plate 12 provided at its both sides in a lengthwise direction and the shaft 6 of the feed roller 3 is locked within a positioning cutout 12a. Thus, since the recording unit 4a of a recording head 4 and the cutout 12a are located at the same position at all times the feed roller 3 is pressed to the recording unit 4a at an accurate position. Therefore, it is not necessary to so strictly position the shaft 6 and shafts 7, 8, whereby assembly can be made readily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper feeding device such as recording paper, and more particularly to a paper feeding device that is easy to assemble.

[Background of the invention]

As this type of paper feeding device, there is a device having a configuration as shown in FIG. This device loads a recording paper (thermal paper) roll 2 into a loading section 1, and feeds the recording paper 2a from there into a recording section 4a of a recording head 4 using a feed roller 3.
It is designed to press against the paper and feed the paper at the same time.

This feed roller 3 is pivotally supported by a rotating shaft 6 at the tip of an arm 5, and the base end of this arm 5 is attached to a main body (not shown).
The arm 5 is supported by a shaft 7 so as to be rotatable relative to the arm 5, and the entire arm 5 is given an elastic force in the direction of arrow A by a spring 13. Therefore, the roller 3 is elastically pressed against the recording head 4 and is rotationally driven in the direction of arrow B, thereby feeding the recording paper 2a in the direction of arrow C. The recording head 4 also has its base end rotatably supported by a shaft 8 relative to the main body, and is subjected to a resilient force by a spring 9.

This paper feeding device is extremely convenient because the feeding roller 3 and arm 4 can be released from the recording head 4 as shown in FIG. 5, and the roll 2 can be replaced or the recording head 4 can be cleaned in this state. be.

However, in this device, the feed roller 3 is supported by a shaft 6, the recording head 4 is supported by a shaft 7, and the recording head 4 is supported by a shaft 8, and since these shafts 6 to 8 are in fixed positions, the device During assembly, there is a problem in that extremely precise precision is required for mutual position adjustment.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a paper feeding device that does not require strict position adjustment of the support points of each component during assembly.

[Structure of the invention]

For this purpose, in the present invention, in a paper feeding device that presses the recording paper against the recording head with a roller, the recording head has a positioning section integrally, and the roller is positioned by the positioning section. I made it.

〔Example〕

Examples of the present invention will be described below. FIG. 1 shows a paper feeding device according to one embodiment.

Components that are the same as those shown in FIGS. 4 and 5 above are given the same reference numerals.

In this embodiment, a slit 5a is formed at the tip of the arm 5, the shaft 6 of the feed roller 3 is inserted into the slit 5a, and a pin 10 is inserted on the side closer to the base end of the arm 5.
A tension spring 11 is suspended between the pin 10 and the shaft 6, so that the feed roller 3 itself is always pulled toward the base end of the arm 5, that is, in the direction indicated by the arrow. Further, the recording head 4 is provided with positioning plates 12 on both sides of the recording head 4 in its longitudinal direction (the direction in which the heating elements are lined up), and the shaft 6 of the feed roller 3 is locked in the positioning notch 12a of the positioning plate 12. It was to so.

Therefore, in this device, if the recording paper 2a is placed on the recording section 4a of the recording head 4 and then the shaft 6 of the paper feed roller 3 is locked in the notch 12a of the positioning plate 12 of the head 4, recording can be performed. The paper 2a is pressed against the recording section 4a of the recording head 4, and preparation is completed as shown in FIG.

On the other hand, the shaft 6 of the paper feed roller 3 is
When removed from a, the paper feed roller 3 can be separated from the recording head 4, as shown in FIG. 3, and the recording paper roll 2 can be replaced and the recording head 4 can be cleaned. At this time, the shaft 6 of the paper feed roller 3 is
1 and located on the back side of the slit 5a.

Here, when comparing the assembly accuracy of the apparatus shown in FIGS. 4 and 5 and the apparatus of this embodiment, it is found that in the apparatus shown in FIGS. 4 and 5, the paper feed roller 3 is In order to press the recording part of the head 4 uniformly, the shafts 6 to 8 of the roller 3, the arm 5, and the recording head 4 are adjusted to approximately ±0.1
It is necessary to assemble and adjust with precision.

On the other hand, in the mechanism of this embodiment, the positioning of the determining plate 12 with respect to the recording head 4 requires an accuracy of about ±0.1 degrees, but the other fulcrums, the axes 6 to 8, require Such precision is not necessary, and a precision of about ±1 degree is sufficient, so in practice, no position adjustment is required during assembly. Further, adjustment of the mutual positional relationship between the recording head 4 and the notch 12a of the positioning plate 12 is much easier than the three-point adjustment of the apparatus shown in FIGS. 4 and 5.

In the above embodiment, the support point of the shaft 6 of the paper feed roller 3 to the arm 5 is movable, but the shaft 6 is fixed to the arm 5, and the support point of the shaft 7 of the arm 5 to the main body is fixed. Similar effects can be expected even if the recording head 4 is movable or the support point of the shaft 8 of the recording head 4 relative to the main body is movable.

That is, as long as the positioning of the paper feed roller 3 with respect to the recording head 4 is performed using the positioning plate 12, the positioning of the roller 3 with respect to the recording section 4a of the recording head 4 will be accurate. 8 1 or 2
By making the above parts movable, assembly can be facilitated.

Further, in the above embodiment, the shaft 6 of the roller 3 is pulled by a spring, but it is also possible to use gravity instead of this spring.

〔Effect of the invention〕

As described above, according to the present invention, since the roller is positioned by the positioning member integrated with the recording head, it is only necessary to pay attention to the positioning accuracy between the two, and the assembly is easy.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a paper feeding device according to an embodiment of the present invention, and FIG.
Figure 3 is a side view of the device when it is set; Figure 3 is a side view of the device with the arm open; Figure 4 is a side view of a conventional paper feeding device when it is set; FIG. 5 is a side view of the arm in an open state. DESCRIPTION OF SYMBOLS 1... Loading part, 2... Recording paper roll, 3... Paper feed roller, 4... Recording head, 5... Arm, 5
a...Slit, 6-8...Shaft, 9...Compression spring, 10...Pin, 11...Tension spring,
12...Positioning hand, 12...Notch, 13...
・Spring. Agent Patent Attorney Tsuneaki Nagao Figure 2

Claims (4)

[Claims] (1) In a paper feeding device that presses paper against a recording head with a roller, the recording head has an integral positioning section, and the roller is positioned by the positioning section. Characteristic paper feeding device. (2) The paper feeding device according to claim 1, wherein the rotation axis position of the roller is determined by the positioning section. (3) Claim 1, wherein the roller is elastically pressed against the recording head.
The paper feeding device according to item 1 or 2. (4) The paper feeding device according to claim 2, wherein the rotating shaft is stably positioned with respect to the positioning portion by an elastic member.