JP3998179B2 - Label peeling device for label printer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a label peeling device for a label printer, and more particularly to a label peeling device for a label printer that transports a label continuum in forward and reverse directions.
[0002]
[Prior art]
The conventional label printer 1 will be outlined with reference to FIG. FIG. 2 is a schematic side view of the label printer 1. The label printer 1 includes a supply unit 3 for the label continuum 2, a printing unit 17, a platen roller 5, and a turning member 6 for peeling using a turning pin. , A peeling roller 7 and a driven roller 8, a drive motor 9, an intermediate gear 10, and a winding shaft 11.
[0003]
The continuous label body 2 has a configuration in which a plurality of labels 13 are temporarily attached to a strip-shaped mount 12 (release paper). The drive mechanism for transferring the label continuum 2 and its mount 12 includes an intermediate gear 10 between the platen roller gear 14 of the platen roller 5 and the peeling roller gear 15 of the peeling roller 7, and a driving motor. The platen roller 5 and the peeling roller 7 can be driven in the same rotational direction by the drive by 9.
[0004]
In the label printer 1 having such a configuration, the drive motor 9 drives the platen roller 5 and the peeling roller 7 through the intermediate gear 10 to rotate the label continuous body 2 from the upstream supply unit 3 to the thermal head of the printing unit 17. 4 (printing head) and the platen roller 5 are supplied so as to be sandwiched, printing is performed together with the transfer, the label 12 is peeled off by turning only the mount 12 at the position of the peeling turning member 6, and the backing 12 is peeled off The belt-like mount 12 is conveyed by being sandwiched between the roller 7 and the driven roller 8, and is taken up by the take-up shaft 11.
[0005]
By changing the gear ratio between the platen roller gear 14 and the peeling roller gear 15 (the gear ratio between the platen roller gear 14 and the intermediate gear 10 is determined from the gear ratio between the peeling roller gear 15 and the intermediate gear 10). From the platen roller 5 so that the transport amount of the backing paper 12 by the downstream peeling roller 7 and the driven roller 8 is larger than the transport amount of the label continuous body 2 by the upstream platen roller 5. The label continuous body 2 and its mount 12 are configured so as not to loosen in the portions up to the peeling turning member 6 and the peeling roller 7.
[0006]
Thus, apart from the transfer and printing of the label continuous body 2 by the forward rotation as described above in the platen roller 5 and the peeling roller 7, the label continuous body 2 is moved in the state where the drive motor 9 is rotated in the reverse direction and printing is not performed. There is a case where a so-called back feed operation is performed in which the ink is transported so as to be slightly returned to the upstream side and the print start position on the label 12 is adjusted. When this back feed is performed, due to the difference in the gear ratio between the platen roller 5 and the peeling roller 7, the peeling roller 7 and the driven roller 8 have more label continuous bodies 2 than the platen roller 5 in the reverse direction (upstream). In order to move back in the lateral direction, slack is generated in the label continuous body 2 and the mount 12 in the front and rear portions of the peeling diverting member 6, and the printing on the label 13 and the peeling action thereof during the next forward rotation are hindered. There is a problem that occurs.
[0007]
Further, by providing a bearing type one-way clutch 16 or the like on the peeling roller gear 15, the peeling roller 7 is driven in the same manner as the platen roller 5 when the drive motor 9 rotates in the forward direction, and rotates at the peeling roller 7 when rotating in the reverse direction. Although the rotation is free so as not to transmit force and only the platen roller 5 can be rotated to prevent the slack of the label continuous body 2 or the mount 12, the bearing type one-way clutch 16 is expensive.
[0008]
The operation of the back feed has an advantage that the printing area on the label 13 can be saved. Although it is desirable to reduce the overall cost in the operation of the label printer 1, it is preferable to use this. There is a problem that the use of the one-way clutch 16 increases the cost.
[0009]
[Problems to be solved by the invention]
The present invention has been considered in view of the above problems, and an object thereof is to provide a label peeling device for a label printer capable of reducing the cost.
[0010]
In addition, the present invention provides a label that can be stably transferred and printed, and the label can be peeled off without using a bearing-type one-way clutch to prevent the slack of the label continuum or mount during backfeed operation. It is an object of the present invention to provide a label peeling device for a printer.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the label peeling measure of the label printer according to claim 1 includes: a continuous label supply unit in which a plurality of labels are temporarily attached to a belt-like mount; and a print head for printing on the label When the platen roller for transferring to sandwich the label strip between the print head, and peeling turning member you peel the label by turning the mount, by sandwiching the mount that this turning A peeling roller and a follower roller section for transporting, and, by forward rotation of the platen roller, for transporting the label continuous body from the supply section in a predetermined transport direction and for stripping the label from the mount a label peeling device of the label printer, the driven roller unit, a driven roller provided rotatably by sandwiching the base sheet between the peeling roller, wherein one end Dynamic rollers provided, comprising a pressing spring for pressing the driven roller to the stripping roller at the other end, and a driven roller arm having a, an arm shaft serving as the rotation fulcrum of the driven roller arm, the said and the peeling roller and the driven roller in pressure contact, and the center of the arm shaft is a rotation fulcrum of the follower roller arm, with respect to a straight line connecting the centers of the driven roller, for centering the peeling of the driven roller set such that the angle which the straight line and forms connecting the center of the roller is an obtuse angle, wherein the time of forward rotation of the peeling roller, the driven roller is a rotational direction biting against the peeling roller, said peeling roller during reverse rotation, characterized in that the driven roller is provided such that the rotation while slip relative to the peeling roller.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, a label peeling apparatus for a label printer according to an embodiment of the present invention will be described with reference to FIG. However, the same parts as those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof will be omitted. FIG. 1 is a schematic side view of a label printer 20. The label printer 20 includes a supply unit 3, a printing unit 17, a platen roller 5, a peeling diverting member 6, a driven roller unit 21, It has a peeling roller 7 and a peeling roller gear 22, a drive motor 9, an intermediate gear 10, a winding shaft 11, and the like.
[0014]
The printing unit 27 includes the thermal head 4, the head support arm 28, the head rotation shaft 29, and the head pressing spring 30. That is, the thermal head 4 is supported on the head support arm 28, and a head rotation shaft 29 that serves as a rotation fulcrum of the head support arm 28 and a head pressing spring 30 for pressing the thermal head 4 against the platen roller 5 are provided. ing.
[0015]
Further, the driven roller portion 21 includes the driven roller 8, a driven roller arm 23, a driven roller shaft 24, an arm shaft 25, and a pressing spring 26. That is, the driven roller 8 is rotatably supported by a driven roller shaft 24 at one end portion of the driven roller arm 23, and the driven roller is pressed against the peeling roller 7 at the other end portion of the driven roller arm 23. A spring 26 is suspended. The driven roller arm 23 is rotatably supported by an arm shaft 25 near the center of the driven roller arm 23 in the longitudinal direction.
[0016]
The peeling roller 7 and the peeling roller gear 22 always rotate together with forward and reverse rotation. That is, the forward / reverse rotational driving force of the drive motor 9 causes the peeling roller 7 to rotate together with the platen roller 5 in the forward / reverse direction via the intermediate gear 10 and the peeling roller gear 22. The gear ratio between the platen roller gear 14 and the intermediate gear 10 is made equal to the gear ratio between the peeling roller gear 15 and the intermediate gear 10.
[0017]
The configuration relationship between the peeling roller 7 and the driven roller 8 will be described. The driven roller 8 is pressed from the lower side to the outer peripheral point P of the peeling roller 7 to which the mount 12 turned by the peeling turning member 6 first comes into contact. The center of the driven roller shaft 24 and the center of the driven roller shaft 24 that is the rotational axis of the driven roller 8 and the center of the driven roller shaft 24 that is the rotating shaft of the driven roller 8 are separated from the center of the driven roller shaft 24. The angle β formed by the straight line M connecting the centers of the rollers 7 is set to be an obtuse angle.
[0018]
With this configuration, the mount 12 is sandwiched between the peeling roller 7 and the driven roller 8, and the driven roller 8 rotates in the biting direction with respect to the peeling roller 7 when the peeling roller 7 is rotated forward. The driven roller 8 rotates with the peeling roller 7 almost without slipping, and a predetermined amount of board is transferred. On the other hand, the platen roller 5 also rotates in the forward direction, and the label continuous body 2 is nipped and transported by the platen roller 5 and the thermal head 4, but the thermal head 4 uses the head rotation shaft 29 as a fulcrum for the platen roller 5. Since it acts in the direction (escape direction) and causes a certain slip, the transfer by the peeling roller 7 and the driven roller 8 becomes the main transfer means.
When the continuous label 2 is back-feeded, that is, when the peeling roller 7 rotates in the reverse direction, the driven roller 8 rotates in the escape direction with respect to the peeling roller 7, and the driven roller 8 slides with respect to the peeling roller 7 with a substantially constant slip. The platen roller 5 is also rotated in the reverse direction, and the label continuous body 2 is nipped and transported by the platen roller 5 and the thermal head 4. Since it acts in the B direction (the biting direction) with fulcrum as the fulcrum, the transfer between the platen roller 5 and the thermal head 4 becomes the main transfer means with almost no slippage.
[0019]
Thus, in the forward rotation of the peeling roller 7 and the platen roller 5, by utilizing the difference in transfer amount that is the characteristic of the biting of the driven roller 8 and the escape action of the thermal head 4, The slack of the label continuum 2 or the mount 12 does not occur on the downstream side, and the label continuum 2 is transferred from the upstream side to the downstream side, and printing and peeling on the label 13 are performed. On the other hand, even in the reverse rotation of the peeling roller 7 and the platen roller 5, the upstream side sandwiching the peeling diverting member 6 by taking advantage of the difference in transfer amount, which is a characteristic of the entrainment of the thermal head 4 and the escape action of the driven roller 8. No slack occurs in the label continuum 2 and the downstream mount 12.
[0020]
【The invention's effect】
As described above, according to the present invention, the conventional bearing type one-way clutch is not used for the peeling roller, and the driven roller acts on the biting side and the escape side with respect to the peeling roller depending on the rotation direction of the peeling roller. With such a configuration, it is possible to prevent the slack of the continuous label body and the backing sheet during the backfeed operation and to realize a stable label peeling function.
[Brief description of the drawings]
FIG. 1 is a schematic side view showing an embodiment of the present invention.
FIG. 2 is a schematic side view showing a conventional example.
[Explanation of symbols]
1 Label printer (Fig. 2) 20 Label printer (Fig. 1)
2 Label continuum 21 Driven roller unit 3 Supply unit 22 Peeling roller gear 4 Thermal head (printing head) 23 Driven roller arm 5 Platen roller 24 Driven roller shaft 6 Peeling turning member 25 Arm shaft 7 Peeling roller 26 Pressure spring 8 Follower roller 28 Head support arm 9 Drive motor 29 Head rotation shaft 10 Intermediate gear 30 Head pressing spring 11 Take-up shaft 12 Mount (release paper)
13 Label 14 Platen roller gear 17 Printing section

Claims (1)

A supply unit of a continuous label body in which a plurality of labels are temporarily attached to a belt-like mount, a print head that prints on the label, and a platen roller that sandwiches and transfers the continuous label body between the print heads , a peeling turning member you peel the label by turning the mount, and the peeling roller and the driven roller unit transferring to sandwich the mount that this turning, which has a, by the forward rotation of the platen roller the label continuum transferred in a predetermined transfer direction, a label peeling device of the label printer for peeling the labels from the backing sheet from the supply unit,
The driven roller portion is
A driven roller that is rotatably provided with the mount interposed between the peeling roller, a pressing spring that provides the driven roller at one end, and presses the driven roller against the peeling roller at the other end. And a driven roller arm provided with an arm shaft serving as a rotation fulcrum of the driven roller arm,
Wherein the driven roller and the stripping roller in a press contact state,
The angle formed by the straight line connecting the center of the driven roller and the center of the peeling roller is an obtuse angle with respect to the straight line connecting the center of the driven roller arm and the center of the driven roller. Set to be
Wherein at the time of forward rotation of the peeling roller, the driven roller is a rotational direction biting against the peeling roller, wherein at the time of reverse rotation of the peeling roller, while the driven roller slippage relative to the peeling roller label peeling device of the label printer, characterized in that provided such that the rotation.

Images