JPH0349846B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a cylinder device that reciprocates a feed table for transportation, cargo handling, machine tools, etc., and in particular to a cylinder device that moves the feed table up to twice the cylinder stroke. It relates to a device that can do this.

(Conventional technology) Traditionally, in the fields of transportation, cargo handling, machine tools, etc.
A so-called double stroke cylinder device is known that can move a feeding table up to twice the cylinder stroke.

For example, what is shown in Figures 6 and 7 is,
This conventional example has a fixed double rod type cylinder 20.
sprocket 21 at a predetermined distance to the left and right of the
21 is installed rotatably, and the left and right rods 22a,
The end of the chain 23 is fixed to the end of the sprocket 22b, the chain 23 is wound around the sprockets 21, 21, and a diameter (D) twice the diameter (d) of the sprocket 21 is attached to each rotating shaft 24 of the sprockets 21, 21. A sprocket 25 is attached, a chain 26 is wound around the sprockets 25, 25, and a table 27 is fixed to the chain 26.

When the piston 28 slides a distance L from the solid line position to the chain line position, the piston rods 22a, 22
b, the rotation shafts 24, 24 rotate via the chain 23 and sprockets 21, 21, and as a result, the table 27 is moved from the solid line position via the sprockets 25, 25, which are twice the diameter (D), and the chain 26. Move to the chain line position, that is, 2 of the moving distance L of the piston 28
It now travels twice as far (2L).

(Problems to be Solved by the Invention) In the case of the conventional example, since the sprocket is installed at a predetermined distance to the left and right of the cylinder, no matter where the piston is located, the distance for the entire device is much larger than the cylinder. The device is large and obstructs the work, and the installation work of the device itself is time-consuming because in addition to fixing the cylinder, a sprocket must also be installed.

In addition, double-stroke cylinders in which the piston is fixed and the cylinder slides have also been known, but in this case too, the entire device is considerably larger than the cylinder, and even when the cylinder is contracting, the entire device is still large when it is extended. The disadvantage is that it requires the same distance as, is larger, and becomes a hindrance to the work.

(Means for solving the problems) This invention solves these inconveniences.
That is, a frame body 2 is arranged along a fixed cylinder 1, and this frame body 2 is fixed to a piston rod 3,
A front wheel 4 and a rear wheel 5 are rotatably attached to the frame body 2 at a distance, and an endless belt 7 is wound around the front wheel 4 and rear wheel 5.
The table 6 is fixed to the endless band 7, and the endless band 7 is fixed in the middle.

(Configuration of Embodiment) FIGS. 1 to 5 show an embodiment of the present invention. In this embodiment, the cylinder 1 is an air cylinder, and a pair of left and right support plates 8, 8 are connected to the cylinder 1. It is fixed to a mounting plate 9 of equal length. A guide bar 10 is hung between the support plates 8, 8, and an end portion of the guide bar 10 is fixed to the lower center of each support plate 8. The frame body 2 is attached to the end of the piston rod 3.
The short side plate 2a is fixed, and the frame 2 is fixed to the short side plate 2a.
, long plates 2b, 2b parallel to the cylinder 1, and a short piece 2c facing the short plate 2a, the short piece 2c is located below the cylinder 1, and has a central hole 1.
1 extrapolates the guide bar 10. Long board 2
horizontal shafts 12, 1 to the front and rear of b, 2b;
2, 13, 13 are fixed outwardly, and to these horizontal shafts 12, 12, 13, 13, front wheels 4, 4 and rear wheels 5, 5, each consisting of a sprocket, are rotatably attached. An endless band 7 consisting of a chain is wound around each front car 4 and each rear car 5, and the table 6 is positioned diagonally above the rear cars 5, 5 as shown by the solid line, and the endless band 7, 7 is wrapped around each front car 4 and each rear car 5. It is hung and fixed. Further, the pins 14, 14 are positioned obliquely below the front cars 4, 4 and protrude from the installation plate 9, and the upper end 14a of each pin 14 is inserted between the two rollers 7a, 7a of the endless belt 7 consisting of a chain. The endless band 7 is fixed in the middle. This pin 1
4, as shown in FIGS. 4 and 5, a male screw 14b screwed into the pin 14 is screwed into a screw hole 9a screwed into the installation plate 9, and fixed with a nut 15 so as to protrude. The chain contacts a collar-shaped chain receiver 14c integrally formed with the pin 14, and the upper end 14a is inserted between the rollers 7a. The height of the pin 14 can be adjusted by the male screw 14b and the screw hole 9a.

(Operation of the Embodiment) When air is supplied from an air inlet/outlet (not shown) to cause the piston 3' to slide in the direction of the arrow (in FIG. 1), the frame 2 integral with the piston rod 3 also moves in the direction of the chain line. At this time, the frame body 2 is
The vehicle is guided by the guide bar 10 through the central hole 11 of the vehicle, and travels straight without losing its balance. Furthermore, as the frame body 2 moves forward, the front cars 4, 4 made of sprockets also move forward, but since the endless bands 7, 7 made of chains are fixed at one point by pins 14, 14, the front cars 4, 4 move forward. It rotates in the direction of the arrow in FIG. 2 and draws in the endless belt 7. As a result, the rear vehicle 5
5 also rotates in the direction of the arrow, and the endless bands 7, 7 are pulled in by the rear wheels 5, 5 while maintaining the tensioned state without loosening, and the piston rod 3, the frame 2, and the front When the cars 4, 4 and the cars behind 5, 5 advance by a distance L, the table 6 integrated with the endless belts 7, 7'
is the distance that the endless belt 7 moves forward while being retracted, that is, it travels twice the distance 2L. Incidentally, when the piston 3' is retreated, each member returns to the solid line state by reversing the above-mentioned action. At the time of return, that is, when the cylinder is contracted, the entire device of the present invention has approximately the same length as the cylinder, and the space required when the cylinder is extended (the space for moving to the position indicated by the chain line in FIG. 2) is
This invention device does not exist and does not interfere with the work.

(Effects of the Invention) Since the present invention has the above-mentioned configuration, the table reciprocates with a stroke twice as long as the cylinder stroke, and when the cylinder is contracted, the entire device becomes approximately the same length as the cylinder, which prevents the device from becoming larger. It does not interfere with the work, and the installation of the device itself only requires fixing the cylinder, making it quick and easy to install.

[Brief explanation of drawings]

1 to 5 show embodiments of this invention,
Figure 1 is a plan view, Figure 2 is a front view, Figure 3 is A-
A sectional view, Fig. 4 is an enlarged sectional view of the endless band fixing means, Fig. 5 is a plan view of the fixing pin and the endless band, Fig. 6 is a plan view of the conventional example, and Fig. 7 is a partial cutaway of the same. It is a front view. 1... Cylinder, 2... Frame, 3... Piston rod, 4... Front car, 5... Rear car, 6... Table, 7... Endless band.

Claims (1)

[Claims] 1. A frame body 2 is arranged along a fixed cylinder 1, this frame body 2 is fixed to a piston rod 3, and a front wheel 4 and a rear wheel 5 are rotatably attached to the frame body 2 at intervals, This double stroke cylinder device is characterized in that an endless band 7 is wound around a front wheel 4 and a rear wheel 5, a table 6 is fixed to the endless band 7, and a part of the endless band 7 is fixed.