JPH0545487Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The disclosed technology is applied to the structural technical field of the printing mechanism of a cassette-type printer that prints price, weight, total price, etc. on labels used in supermarket back yards, etc. belong to

<Summary> This invention is based on a rotating spindle that is linked to a power transmission device such as a timing belt and a pulley from the motor of a printer such as a cassette printer installed in the back yard of a supermarket or at a cash register in a store. This invention relates to the structure of a printer's platen roll, which is equipped with a platen roll body made of rubber or the like on its outer periphery and faces a printing head such as a thermal head. On the other hand, this invention relates to a platen roll structure for a printer in which a rotating spindle is detachably connected and detached via a pin provided at its tip and a notch on a rotating shaft.

<Prior art> As is well known, the distribution market has recently become diverse and complex. For example, in supermarket back yards, prices, weights, etc. of products are
There is a so-called label pasting business that displays pricing such as the total price.

For such work, printers with operation keys such as numeric keys on the front are widely used as integrated devices with electronic scales, but with the rise of the distribution market, work on registers, etc. Printing receipts requires a variety of printing modes depending on the size and type of product, and installing multiple calculators and printers each time is not only costly but also operationally difficult. However, there was no advantage, and there was the disadvantage that it was extremely cumbersome to tally up data after the day's work was completed.

To deal with this, for example, JP-A-60-188821
As disclosed in Invention No. 60-145056 and Invention No. 60-145056, so-called cassette printers have been developed and put into practical use, and various technologies have been researched and developed.

In these recently developed cassette printers, the cassettes for each print mode can be easily attached and detached from the printer to make register work smoother, but the process is relatively slow. Since it is a new technology, there are potentially many problems that must be solved.

The cassette-type printer 1 is briefly explained with reference to FIG. 6. The cassette-type printer 1 has a setting part 4 for a cassette 3 that can be raised and lowered on the upper part of a base 2, and a guide slit 6, a guide slit 6, A print sheet 8 with labels affixed at predetermined intervals to a mount (not shown) is pulled out via a guide 7, and is passed through a guide 10 and a guide slit 11 formed on a frame 9 between a platen roll 12 and a thermal head 13 of a print head. is wound up on the take-up roll 14, and the numeric keypad 1 of the operation section is pressed.
Unit price, weight, etc. are printed on the label by a predetermined operation in step 5.

<Problems to be solved by the invention> However, recent cassette type printers 1 and the like are easy to use, avoid interference with the surroundings, and are compact; As shown in Figure 9, platen roll 1
2 frame 9 guide 10, guide slit 1
1, as well as the guide roller 16 of the feeding section of the print sheet 8 of the cassette 3,
The layout of the guide slit 6 and the like is extremely complicated and complicated in terms of position.

By the way, printouts that are repeated frequently over time, and the setting and resetting of the cassette 3 that differs each time the cassette 3 is replaced, can inevitably cause paper dust to adhere to the platen roll, resulting in printing defects and slips in label feeding. In order to deal with this, the platen roll 1 may be changed periodically or irregularly.
2 must be cleaned and possibly replaced.

However, the conventional platen roll 12
In this case, as shown in Fig. 7, the thermal head 1
A rotary spindle 18 is integrally fitted with a platen roll body 17 made of rubber or the like, on which the print sheet 8 slides by pressing it against the base 19 of the rotary spindle 18. In order to reliably transmit the rotational torque during printing to the transmission device, it is firmly connected, and therefore, as described above, the platen roll 12 has a complicated connection structure with the frame 9 and the cassette 3 with the set part 4. Therefore, there were disadvantages in that it was extremely difficult to perform manual work, and removal was time-consuming, and cleaning and replacement operations could not be carried out smoothly.

<Purpose of the invention> The purpose of this invention is to develop a technology based on the above-mentioned conventional technology to solve the problem of maintenance of the platen roll in relation to other mechanical parts of printers such as cassette type printers installed in the back yards of supermarkets, etc. As a result, maintenance work such as cleaning and replacement can be performed smoothly and reliably without interfering with the original functions of printers, which are aimed at improving print work efficiency and making printers more compact. It is an object of the present invention to provide an excellent printer platen roll structure that allows printing on labels and is beneficial to the field of printing technology utilization in the distribution industry.

<Means/effects for solving the problems> In accordance with the above-mentioned purpose, the structure of this invention, which has the gist of the above-mentioned utility model registration claims, is set in the back yard of a supermarket, etc., in order to solve the above-mentioned problems. The platen roll, which faces the print head of printers such as cassette printers and is installed with a narrow and complicated connection with the surrounding mechanical parts, is pivoted by a bearing from a power transmission device such as a timing belt or pulley. A rotary spindle is rotated by a rotary shaft via a connecting body, and a platen roll body mounted on the rotary spindle presses a print sheet against a print head in a predetermined position and slides it, thereby producing a predetermined printout on the label, etc. However, due to frequent printing over time or replacement of the print roll of a cassette printer, paper dust etc. may adhere to the platen roll body, or label marks may be formed over time. When cleaning the power transmission device body or replacing the platen roll, if printing defects or slippage occurs due to markings on the label, it is necessary to remove the power transmission device from its rotating spindle and rotating shaft. Smoothly remove the spindle via the removable coupling body, perform cleaning or replacement, and then attach the rotating spindle to the rotating shaft with one touch via the coupling body to ensure accurate printing. It is easy to use and easy to maintain by taking technical measures to make it possible to transmit information.

<Example> Next, an example of this invention will be described below with reference to FIG. 6 and based on FIGS. 1 to 5. Note that the same parts as in FIGS. 7 to 9 will be described using the same reference numerals.

In the embodiment shown in FIGS. 1 and 2, reference numeral 121 is a platen roll which is the central point of the invention, and is installed in the cassette type printer 1 installed in the back yard of a supermarket shown in FIG. It is provided opposite to a print head 13 of a thermal printer or the like.

Therefore, the platen roll 121 is
Similar to the conventional configuration shown in the figure, the guide 10, guide slit 11 on the frame 9 side, guide 7, guide slit 6, guide roller 16, etc. on the cassette 3 side are arranged in a complicated routing structure in a narrow area. be.

Reference numeral 20 denotes a power transmission device, which is provided inside the lower side of the frame 9, and a timing belt 21 from a timing pulley of a motor (not shown) is engaged with a timing pulley 22, and is connected to upper and lower bearings 23, 23'. Exchangeably rotating shaft 241
The base of the platen roll 121 is inserted so that rotational torque can be transmitted to the platen roll 121.

As shown in FIG. 2, the rotating shaft 241 is integrally formed with a small-diameter shank 25 at the tip from the approximately central portion and a large-diameter portion 26 on the base side, with a stepped portion interposed therebetween. is provided with a washer 27, and an E-ring 28 is interposed between the washer 27 and the bearing 23.

A hook pin 29 is integrally implanted and fixed horizontally in the upper part of the base 26 of the large diameter portion.

On the other hand, the rotary spindle 30 inside the platen roll 121 is formed of a predetermined metal pipe, and the base side thereof is machined to have a large inner diameter via a stepped portion 31, and the inner diameter is increased along the axial direction toward the lower end. A predetermined number of notches 32, 32, .

Incidentally, as a matter of course, the rotating spindle 30
The upper inner diameter and lower inner diameter of the rotating shaft 241
The shank 25 and the lower base 26 are in close contact with each other so that they can rotate together.

A platen roll main body 17 made of rubber is previously vulcanized and tightly fixed to the outside of the rotating spindle 30.

Therefore, the platen roll 121 of this invention
can be attached to and detached from the rotating shaft 241 with a single touch, and rotational torque is transmitted in the fitted state.

<Embodiment - Effect> In the above-described configuration, in the normal operating state, as shown in FIG. 2, the platen roll 121 inserts the lower end of the rotating spindle 30 from the upper part of the shank 25 of the rotating shaft 241 and twists it.
One of the notches 32, 32, . Rotating shaft 2 supported by
41 rotates, rotational torque is transmitted by the engagement of the pin 29 and notch 32 as a connecting body, the platen roll 121 rotates in a predetermined manner, and the printing head 13
While holding and pressing the print sheet 8 fed out from the cassette 3 between the
A predetermined printing mechanism such as unit price, total price, etc. is printed.

Of course, the setting and resetting of the cassette 3 according to the type of product is performed in the same manner as in the conventional method.

As a result of repeated printing over time and the setting and resetting of the cassette 3, paper dust may adhere to the surface of the platen roll body 17, or marks of labels on the print sheet may be engraved, resulting in poor printing or If a malfunction occurs such as a slip in label feeding, the platen roll body 17 may be cleaned and, if necessary, a new platen roll 12
1. In that case, by stopping the motor and pulling up the platen roll 121 from above, the notch 32 will detach from the pin 29, and the platen roll 121 can be smoothly removed from the rotating shaft 241 with one touch. This ensures smooth cleaning.

Then, after cleaning, 5 platen rolls 1
21, or when resetting a new platen roll 121, the platen roll 12
1 from above the rotating shaft 241, and by twisting it in the latter half of insertion, the lower notches 32, 32 of the rotating spindle 30 are opened.
... engages with the pin 29 of the rotating shaft 241, and the resetting of the platen roll 121 relative to the rotating shaft 241 is completed in one touch.

Then, it is subjected to printing work again.

Therefore, according to this invention, the platen roll 121 can be cleaned and replaced regularly and irregularly, and printing defects and label slips do not always occur, and reliable printing functions as designed are maintained. It turns out.

Next, the embodiment shown in FIG.
A plurality of pins 28, 28, . Drill four L-shaped notches 32', 32'... extending in the direction, and twist the notches 3 to the pins 28, 28...
2', 32'... are inserted so that they do not accidentally come off during rotation,
When setting and resetting, please use the platen roll 12.
2 to the rotary shaft 242 side while rotating, it is possible to engage and disengage substantially in the same manner as in the above embodiment, and the maintenance work can be performed smoothly as well. It is a mode.

Furthermore, the embodiment shown in FIG.
On the 3 side, an engaging part 33 as a connecting body with a rectangular cross section is formed at the upper part of the washer 27 at the intermediate part between the small diameter shank 25 and the large diameter base 26, whereas on the platen roll 123 side, a rotating spindle is formed on the platen roll 123 side. 30 is formed with a rectangular recess 34 that can be fitted into the engaging portion 33, and the platen roll 123 can be set and reset with respect to the rotating shaft 241, and torque can be transmitted during rotation. There is no difference in effect from each of the above embodiments.

Furthermore, in the embodiment shown in FIG. 5, a permanent magnet 35 extending partially along the axial direction is integrally fitted and joined to the washer 27 of the large diameter portion 26 of the rotating shaft 244, while the platen roll On the 124 side, a permanent magnet 36 corresponding to the permanent magnet 35 is provided at the lower end of the rotary spindle 30' to facilitate setting and resetting, and to enable torque transmission during rotation. This is a mode in which the prevention of the slip-off is guaranteed.

As a design change in this embodiment, the permanent magnet 35 on the rotating shaft 244 side is made to project slightly in the radial direction, and the inner side of the permanent magnet 36 on the rotating spindle 30' on the platen roll 124 side is formed in a groove shape. , torque transmission can be performed more reliably.

It goes without saying that the embodiments of this invention are not limited to the above-mentioned embodiments. For example, a screw may be carved into the lower end of the rotating shaft and the rotating spindle of the platen roll so that the screws can be tightened during rotation. By this, setting, resetting, and torque transmission are possible through the screw engagement,
Furthermore, various embodiments can be adopted, such as forming a spline on the rotating spindle of the platen roll so that the rotating shaft can be set and reset freely and torque can be transmitted.

In addition, it can be applied not only to cassette printers but also to other printers, and can be installed not only in supermarket back yards but also in scale printers installed at store registers. Of course.

The present invention can be applied not only to printed sheets with labels, but also to printed sheets for issuing receipts.

<Effects of the invention> As described above, according to this invention, in the platen roll that is installed opposite to the print head of a printer such as a cassette type printer that is basically installed in the back yard of a supermarket, the cassette, take-up roll, Furthermore, even if the platen roll has a complicated and narrow joint structure close to the guide and guide slit, paper dust and other marks may adhere to it or leave marks from labels due to repeated use and movement over time. Even if the label cannot be printed smoothly and there are printing defects or slips when feeding the label, cleaning and replacement can be done with one touch, and there is no problem with maintenance and maintenance. It is played.

Further, even when performing a printing operation, the rotational torque to the platen roll can be transmitted without any problem.

Since the rotary spindle of the platen roll and the rotary shaft connected to the power transmission device are interposed with a connecting body that can be engaged and disengaged in a single touch, as mentioned above, the rotational torque during operation is is transmitted without any problem, and when performing maintenance such as cleaning or replacement, the platen roll can be pulled out from the rotating shaft with one touch.
In addition, since it can be reattached and there is no problem with the connection between the platen roll and the surrounding mechanical parts, there is an excellent effect of making the printer more compact and not interfering with the degree of freedom in design.

Moreover, there is an advantage that the structure of the platen roll for printing, especially in terms of design, is not affected.

[Brief explanation of the drawing]

Figures 1 to 5 are explanatory diagrams of embodiments of this invention. Figure 1 is a partially sectional side view of one embodiment, Figure 2 is a perspective view of the same platen roll and rotating shaft, and Figure 3 is a diagram of another embodiment. FIG. 4 is a perspective view corresponding to FIG. 2 of another embodiment, FIG. 5 is a perspective view corresponding to FIG. 2 of yet another embodiment, and FIG. 6 is a cassette printer. FIG. 7 is a partially cutaway schematic perspective view of a platen roll based on the prior art;
FIG. 8 is a side view of a part of a platen roll connected to a printer based on the prior art, and FIG. 9 is a plan view thereof. 1...Printer, 20...Power transmission device, 17
...Platen roll body, 30...Rotating spindle, 121...Platen roll, 28, 31...
Connecting body, 241...rotating shaft.

Claims (1)

[Claims for Utility Model Registration] (1) In a platen roll structure having a rotating spindle connected to a power transmission device of a printer and having a platen roll body exterior, the rotation spindle is connected to a rotating shaft connected to the power transmission device. A printer's platen roll structure is characterized in that it is formed so that it can be attached and detached through the body. (2) The platen roll structure of a printer according to claim 1, wherein the rotating spindle is formed of a pipe. (3) The platen roll structure for a printer according to claim 1, wherein the connecting body is formed by a pin of a rotating shaft and a notch of a rotating spindle. (4) The platen roll structure for a printer according to claim 1, wherein the connecting body is formed by a rotation preventing fitting portion of a rotating shaft and a rotating spindle. (5) The platen roll structure of a printer according to claim 1, wherein the connecting body is made of a magnetic material. (6) The platen roll structure for a printer according to claim 1, wherein the connecting body is formed by threading a rotating shaft and a rotating spindle in a tightening side direction. (7) The platen roll structure for a printer according to claim 1, wherein the connecting body is formed of a spline between a rotating shaft and a rotating spindle.