JPS629108Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a feed pawl device with a guiding slope in a single-piece printing machine.

Single-piece printing machines are used to print list prices on price tags attached to items such as clothing.

Since price tags and the like that are printed by this type of printing machine are small and relatively thick single pieces, the single pieces may warp. In addition, a thin string for attaching to clothing is usually attached in advance before printing. Furthermore, since it is printing a list price, etc., it is often necessary to print on a relatively small amount of single pieces of various sizes. For this reason, special measures are required for the feeding mechanism and the like.

First, the basic configuration of a single-piece printing machine proposed by the inventor of the present invention will be explained with reference to FIG.

A plate holder 1 is provided with a hopper 2, and the hopper 2 accommodates a large number of single pieces 3 such as price tags. The hopper 2 consists of a positioning member 20, a bottom plate 21, and a rear presser plate 22. The single piece 3 is pushed up by the bottom plate 21 from below, and the positioning member 20
It is positioned by From the rear, the single piece 3 is held down by a rear holding plate 22 for regulating displacement. Among the single pieces housed in the hopper 2, the uppermost single piece 3a is sent to the plate holder 1 via the hopper gate 5 by the single piece feed claw 4. The hopper gate 5 prevents the feeding of two single pieces 3. Above the plate holder 1, there is provided a print head 6 that moves up and down with respect to the plate holder 1, and an ink tray 7 that moves forward and backward into the movement space of the print head 6 for each print. The print head 6 transmits the rotation of the motor to an output shaft via a gearbox, clutch, etc., and is moved up and down under the control of a disc-shaped control cam provided on the output shaft.
The printing head 6 is loaded with a cheese box for holding rubber type and the like. Similarly, the ink tray 7 is moved left and right by controlling the output of the motor with a control cam and via a link mechanism. The printed single piece is received in the single piece receiving device 8.

Next, the operation of the single-piece printing machine described above will be explained. The single piece 3a in the uppermost position is conveyed to the plate holder 1 by the feed claw 4, and is ready for printing (FIG. 1a).

The ink tray 7 advances into the moving area of the print head 6,
The characters in the check box of the printing head 6 are brought into contact with the ink tray 7, and so-called inking is performed (FIG. 1b).

When the ink tray 7 is retracted, the print head 6
is lowered and the single piece 3 placed on the plate holder 1
A is printed (FIG. 1c).

When printing is completed, the printing head 6 is raised and the single piece 3b to be printed next is sent by the feeding claw 4, and the printed single piece 3a is pushed by the single piece 3b and stored in the single piece receiving device 8. (Figure 1d).

In such a single piece printing machine, the single piece 3 is connected to the hopper 2.
Since a slight deviation occurs when the single piece 3 is set, problems such as two-sheet feeding may occur when the single piece 3 is fed by the feeding claw 4. For this reason, the displacement of the single piece is corrected by pressing the single piece 3 from behind with the rear presser plate 22 or by increasing the biasing force of the spring 23 which pushes up the single piece 3 from below with the bottom plate 21.

However, if the single piece 3 is aligned with the hopper 2 in this way, the friction during feeding will increase, which may cause problems such as feeding errors, damage to the single piece 3, or failure of the feeding mechanism, so it is necessary to set it loosely. I don't get it. For this reason, there was a possibility that the single piece 3 would be displaced due to vibrations during operation, resulting in two pieces of single pieces being fed.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a feed pawl device for a single-piece printing machine that can reliably prevent double-feeding of a single piece even if the hopper is set loosely.

In order to achieve the above object, the feed pawl device having a guiding slope in a single piece printing machine according to the present invention has a positioning member for regulating the position of the uppermost single piece against which the uppermost single piece is pressed, and A single piece hopper that pushes up a number of single pieces from the side engages with the side surface in the thickness direction of the uppermost single piece to feed the single pieces one by one to the printing position and print. A feeding claw device for a single-piece printing machine that performs printing has a hanging part having a hanging allowance smaller than the thickness of the single piece, and a first inclination angle that is connected to the hanging part and suppresses warping of a small single piece. a first guide side; a second guide side connected to the first guide side and extending forward and having a second inclination angle for suppressing large warping of the single piece; It is comprised of a single piece hopper, a transfer unit that moves forward and backward between the single piece hopper and the printing position, and a biasing means that urges the feed pawl in the single piece direction.

According to the above structure, the object of the present invention can be completely achieved.

Hereinafter, the present invention will be explained in more detail with reference to the drawings and the like.

FIGS. 2 and 3 are a plan view and a side view showing an embodiment of a feed claw of a single-piece printing machine according to the present invention.
The single piece 3 is held down from behind by a rear press plate 22 and pushed up from below by a bottom plate 21. single piece 3
The uppermost single piece 3a is regulated by a positioning member 20 that regulates the upper position of the single piece. The tip of the positioning member 20 cooperates with the plate holder 1 to form a hopper gate 5.

The feed pawls 4 are provided at three locations corresponding to the narrow grooves of the positioning member 20, are pivotally supported by the shaft 42 of the transfer portion 41, and are biased from above in the direction of the single piece 3 by a spring 43. The reference position of the feed claw 4 is set by a screw 44.

FIG. 4 is a side view showing the tip of the feed claw according to the present invention in detail.

The feed claw 4 is a claw for feeding the uppermost single piece of the single pieces pushed up from the hopper to the plate holder 1 one by one via the hopper gate 5.

The feed claw 4 has a hanging portion 4a, a first guide side 4b,
It is composed of a second guide side 4c and an escape groove 4d.

The hanging portion 4a protrudes rearward from perpendicular to the moving direction of the feed pawl 4 by a height t having a slight inclination angle, and engages with the side surface of the single piece 3 in the thickness direction here.
The relief groove 4d is provided so that the hanging portion 4a can securely catch the single piece 3.

The first guide side 4b is a guide for a small single-piece warp and has an angle α with respect to the direction of movement. The second guide side 4c is a guide for large single-piece warping and has an angle of β with respect to the direction of movement.

The inventor of the present invention conducted various experiments on the feed claw having the above shape and found the optimum values of α, β, t, etc.

FIG. 5 is a diagram for explaining feeding experimental examples of various shapes of the feeding claw of the present invention.

FIG. 5a shows an example of feeding when there is no displacement of a single piece (ideal state). In this case, even without the first guide side 4b, there is no problem in feeding the single piece as long as the dimension t is shorter than the thickness of the single piece.

FIG. 5b shows an example of feeding when the first guide side 4b has a large angle α and there is a deviation of a single piece. In this case, if the inclination angle of the first guide side 4b is large, even a slight deviation will cause two sheets to be fed.

FIG. 5c shows an example of feeding when the inclination angle of the first guide side 4b is made small. In this case, since the first guide side 4b captures and guides the upper surface of the single piece, there is no need to worry about two sheets being fed even if the single piece is slightly shifted.

FIG. 5d shows an example of feeding when the inclination angle of the first guide side 4b is further reduced to zero. In this case, the paper is fed only by the friction of the second guide side 4c before it is hooked on the hanging portion 4a, and this is the same phenomenon as when the deviation becomes extremely large, causing two sheets to be fed.

As a result of conducting experiments in various ways, α
= 2.5 degrees and β = 23.5 degrees were confirmed to be the optimal inclination angles.

In addition, the height t of the hanging part 4a is 0.5 in thickness of a single piece.
When the length is 0.35 mm or more, t = 0.35 mm is the optimal length without needing to feed two sheets, and there are fewer feeding errors.

For thin single pieces (less than 0.5mm), t=0.25mm
Although this is optimal in terms of functionality, it affects the life of the feed claw and has a short life.

As explained in detail above, according to the present invention, since the feeding claw is provided with a guide side, it is no longer possible to feed two pieces or make mistakes in feeding even when a single piece is warped or misaligned.

In addition, in the embodiment of the present invention, the first guide side and the second guide side are made into a straight line and the connection part is smoothly connected for convenience in processing the parts.
These may be made into continuous curves so that functionally similar effects can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining the basic configuration of a single-piece printing machine, and FIGS. 2 and 3 are a plan view and a side view showing an embodiment of the feeding claw of the single-piece printing machine according to the present invention.
FIG. 4 is a side view showing in detail the tip of the feed claw according to the present invention, and FIG. 5 is a diagram for explaining feeding embodiments of various shapes of the feed claw according to the present invention. 1... Plate holder, 2... Hopper, 20... Positioning member, 21... Bottom plate, 22... Rear press plate, 2
3... Spring, 3... Single piece, 4... Feed claw, 4a...
...Hanging portion, 4b...First guide side, 4c...Second guide side, 4d...Escape groove, 5...Hopper gate, 6...Print head, 7...Ink tray, 8...
...Single piece receiving device.

Claims (1)

[Scope of utility model registration request] It has a positioning member that regulates the position of the uppermost single piece against which the uppermost single piece is pressed. In a feeding claw device of a single-piece printing machine that engages with a side surface in the thickness direction to send single pieces one by one to a printing position and perform printing, a hook having a hanging allowance smaller than the thickness of the single piece. a first guide side that is connected to the hanging part and has a first inclination angle to suppress a small warp of a single piece; and a first guide side that is connected to the first guide side and extends forward to prevent a large warp of a single piece. a feed pawl having a second guide side having a second inclination angle for pressing; a transfer unit that moves the feed pawl back and forth between the single-piece hopper and the printing position; and urging the feed pawl in the single-piece direction. 1. A feed pawl device having a guide slope for a single-piece printing machine, characterized in that the feed pawl device is comprised of a biasing means that does.