JPS6339000Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is designed to prevent the wrapping paper of a paper wrapping machine used for mirror-finishing workpieces from clogging. This invention relates to an improvement in an automatic wrapping paper feeding device for a paper wrapping machine, which feeds a new paper surface to a wrapping section.

(Prior Art) Generally, a paper wrapping machine is equipped with a wrapping head consisting of a pressing member that presses the wrapping paper paid out from a wrapping paper roll against the workpiece, and a linear drive source that moves this pressing member forward and backward relative to the workpiece. This wrapping head is raised and lowered relative to the workpiece by a lifting cylinder attached to the machine frame. On the other hand, the automatic wrapping paper feed device consists of a drive wheel that rotates the wrapping paper every time the workpiece is processed, and a driven wheel that sandwiches the wrapping paper and is pressed against the drive wheel. Prior Art The wrapping paper automatic feed device is composed of a rotating shaft that rotates forward and backward by a predetermined angle in conjunction with the ascending and descending movement of the wrapping head, and a one-way rotation transmission means that rotates a drive wheel only in the direction of the rotational movement of the rotating shaft caused by the ascending of the wrapping head (see Japanese Utility Model Laid-Open Publication No. 56-62843). However, this prior art device requires complex mechanisms such as a cam follower that rotates the rotating shaft forward and backward in conjunction with the ascending and descending movement of the wrapping head, a one-way clutch, etc., which makes the equipment expensive, and these complex mechanisms occupy a large space, making it large in size.

(Purpose of the invention) An object of the invention is to provide an automatic wrapping paper feeding device for a paper wrapping machine that has a simple structure, can be downsized, and can therefore be installed in a small space.

(Structure of the invention) In the wrapping paper automatic feeding device of the paper wrapping machine of the present invention, a linear drive source that advances and retreats the pressing member of the wrapping head moves the wrapping paper only in conjunction with the linear backward movement that moves the pressing member backward. It is equipped with a ratchet mechanism that connects the linear drive source and the drive wheels so as to send the power. According to this structure, only a simple ratchet mechanism needs to be provided on the wrapping head, and the structure is simple and inexpensive, and the overall size is reduced, so that it can be applied to narrow spaces.

(Embodiment) An embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 shows a paper wrapping machine 12 equipped with an automatic wrapping paper feeding device 10 according to the present invention.
This paper lapping machine 12 has a wrapping head 20 that is raised and lowered relative to a workpiece 18 by a lifting cylinder 16 mounted on a machine frame 14.
As shown in FIG.
8 and a linear drive source 28 such as a cylinder that presses the pressing member against the workpiece 18. The pressing member 26 is attached to a movable holder 30 connected to the piston 28a of the linear drive source 28, and the movable holder 30 has a guide rod 36 that is slidably supported by a fixed holder 32 via a thrust bearing 34. The linear drive source 28 is supported by a fixed holder 32, and the wrapping paper roll 22 is supported by a bracket 38 extending from one side of the fixed holder 32. The wrapping paper 24 fed out from the wrapping paper roll 22 is connected to one guide pin 40 on the movable holder 30, the pressing member 26, and the movable holder 30.
The wrapping paper is introduced into the automatic wrapping paper feeding device 10 of the present invention through the other upper guide pin 40'.

Automatic wrapping paper feeding device 10 of the present invention
As shown in FIGS. 2 and 3, the wrapping paper 24 is sandwiched between a driving wheel 44 such as a serration gear provided on a bracket 42 extending from the other side of the fixed holder 32. A driven wheel 46, also like a serration gear, is pressed by a driven wheel 44. The driven wheel 46 is
As shown in FIGS. 2 and 4, the frame 48 is rotatably supported by a frame 48, and the frame 48 is pivoted by a pin 52 to an arm 50 that is pivotally supported by a fixed holder 32, and a lock bolt passes through the arm 50. 54 has an arcuate groove 48a into which the groove 54 engages. Therefore, by loosening the lock bolt 54 and swinging the frame 48 about the pin 52, the driven wheel 46 can be pressed against or separated from the driving wheel 44. In this manner, the wrapping paper 24 can be inserted or removed between the driving wheel 44 and the driven wheel 46.

In addition, this wrapping paper automatic feeding device 1
0 is equipped with a ratchet mechanism 56 that rotates the drive wheel 44 only in conjunction with the linear backward motion of the linear drive source 28 that moves the pressing member 26 backward. This ratchet mechanism 56 consists of a ratchet pawl 60 that is pivotally connected to the movable holder 30 by a pin 58 and a ratchet 62 that meshes with the ratchet pawl 60. The ratchet 62 is coaxially connected to the drive wheel 44.
The ratchet pawl 60 is constantly engaged with the ratchet 62 by a spring 64. The ratchet 62 is provided with a reversal prevention piece 68 which is always engaged with the ratchet by a spring 66.

Next, the operation of the above-mentioned device is described. After the wrapping head 20 is lowered to the workpiece 18, the linear drive source 28 is driven to move the pressing member 26 forward, and the wrapping paper 24 is pressed against the workpiece 18 for polishing. Do the following. When the pressing member 26 moves forward, the ratchet pawl 60 moves forward as it is pulled by the movable holder 30, but the ratchet 62 is prevented from rotating by the anti-reverse piece 68. After the polishing process is completed, the linear drive source 28
When the press member 26 is moved back, the ratchet claw 60 is also moved back via the movable holder 30, so the ratchet claw 60 drives the ratchet 62 in the direction of the arrow in FIG. Then, the wrapping paper 24 is fed by a predetermined pitch.

(Effects of the invention) According to the invention, as described above, the wrapping paper is fed by the ratchet mechanism that is driven in conjunction with the forward and backward movement of the pressing member of the wrapping head, so that the wrapping paper can be miniaturized within the wrapping head. Therefore, the overall cost is low and it has the practical advantage of being able to be installed in a narrow space.

[Brief explanation of drawings]

Fig. 1 is a schematic front view of a paper wrapping machine equipped with an automatic wrapping paper feeding device according to the present invention, and Fig. 2 is a top view of a part of the wrapping head having an automatic wrapping paper feeding device according to the present invention in horizontal section. 3 is a perspective view of the main parts of the present invention, and FIG. 4 is a longitudinal sectional view showing the mounting structure of the driven wheel. 10...Wrapping paper automatic feeding device, 12
... Paper lap machine, 18 ... Workpiece, 20
... Wrapping head, 22 ... Wrapping paper roll, 24 ... Wrapping paper, 26
... Pressing member, 28 ... Linear drive source, 44 ... Drive wheel, 46 ... Driven wheel, 56 ... Ratchet mechanism.

Claims (1)

[Scope of utility model registration request] The above-mentioned wrapping of a paper wrapping machine is provided with a wrapping head consisting of a pressing member that presses the wrapping paper fed out from the wrapping paper roll against the workpiece, and a linear drive source that moves the pressing member forward and backward with respect to the workpiece. In an automatic wrapping paper feeding device for a paper wrapping machine, which comprises a driving wheel that rotates paper each time the workpiece is processed and a driven wheel that is pressed against the driving wheel with the wrapping paper in between, the linear driving source is A paper wrapping machine comprising a ratchet mechanism that connects the linear drive source and the drive wheel so that the drive wheel feeds the wrapping paper in conjunction with only the linear backward movement of the pressing member. automatic wrapping paper feeding device.