JPH0719631Y2 - Pressing device for upper roll in roll feeder - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressing device for pressing an upper roll against a lower roll in a roll feeder for intermittently feeding a material to a press machine by a predetermined length.

[0002]

2. Description of the Related Art An upper roll pressing device in a conventional roll feeder rotatably supports the upper roll, and a yoke axially supported by a machine frame is urged by a spring rod spring to press the upper roll. The pressure roller is pressed against a lower roll that rotates in synchronism with the crank shaft, and the upper and lower rolls sandwich and feed the material.

[0003]

The roll feeder, which feeds the material by sandwiching it with the upper and lower rolls, is suitable for feeding the material of the high-speed press machine because the rolls are in rotary motion.
Since the roll repeats rapid rotation and intermittent rotation of sudden stop, it is unavoidable that the feed amount of the material for a predetermined length varies by about ± 0,05 mm.

However, the pressed product is ± 0,01 mm
Since the following high accuracy is required, conventionally, a material with pin holes in which pin holes are formed at equal intervals on both sides of a tape-shaped material is used, and it is vertically moved by a pilot release cam that rotates in synchronization with the crankshaft. After lifting the yoke with a lifter to make the material free, insert the pilot pin provided in the upper die into the material pin hole, correct the position of the material fed by the fixed length, and then press work. Was there.

When using a pin-hole material, the pin-hole portions on both sides of the material must be discarded after pressing. In general, since press work is inexpensive, high precision and improvement in material yield have been major problems for profit.

This invention solves the above-mentioned problems, and an object thereof is to provide a pressing device for the upper roll in a roll feeder, which enables press processing with high precision by using a material without pin holes. To do.

[0007]

Means for Solving the Problems] pressing device a roll on according to this invention is a roll on to deliver to sandwich the material at a lower roll, swingably pivotally supported by machine frame axis Press the supported yoke and the upper roll onto the lower roll.
Spring to urge the yoke downward to force it
And a pilot release cam attached to the drive shaft that rotates in synchronization with the crankshaft , move up and down ,
Roll made with a, and the lifter to push up the serial York
A pressing device of the upper roll in the feeder, the
The lifted portion of the lifter yoke is below the tip of the yoke.
The lifter yoke pushers , which are spaced apart from each other.
Between the upper part and the tip side of the yoke, the lifter
Due to the upward movement, there is no gap between the yoke and the tip side.
Don't lift the tip of the yoke even when
Una, compression coil of elasticity weaker than that of the spring
Spring made of spring is characterized in that it is fitted.

[0008]

In the upper roll pressing device according to the present invention, at the beginning of feeding the material, the upper roll is strongly pressed against the lower roll by the elastic force of the spring of the spring rod, so that the material is firmly held and fed. When the pilot release cam rotates and pushes the lifter upward, the spring installed between the lifter and the yoke is compressed and the reaction force of the spring rod against the spring increases, weakening the pressing force of the upper roll. . That is, the clamping force for sandwiching the material is
It is controlled so that the beginning of feeding is strong and the end of feeding is weak.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

A lower roll 3 integral with a shaft 2 which is rotatably supported by a machine frame 1 is adapted to intermittently rotate in synchronization with a crank shaft as is known. A yoke 5 is swingably supported on a support shaft 4 provided in the machine frame 1, and an upper roll 7 is rotatably supported by a shaft 6 attached to the yoke 5 via a bearing 8.

A spring rod 10 having a lower end fitted in a recess 9 on the upper surface of the yoke 5 is loosely fitted in a spring adjuster 11 screwed to the machine frame 1, and the spring adjuster 1
The upper roll 7 is pressed against the lower roll 3 by the elastic force of the spring 13 mounted between the flange 1 of the spring rod 10 and the flange 12 of the spring rod 10. The pressing force of the upper roll 7, which is in pressure contact with the lower roll 3, is adjusted by adjusting the elasticity of the spring 13 by rotating the spring adjuster 11 screwed into the machine frame 1, and has an optimum pressing force according to the material W.

Reference numeral 15 denotes a drive shaft that rotates in synchronization with the crank shaft, and is rotatably supported by the machine frame 1. A pilot release cam 16 is fixed to the drive shaft 15 by a cup screw 17. This pilot release cam 1
The outer shape of 6 is 0 ° at the top dead center of the crankshaft and 180 at the bottom dead center.
When the angle is °, it is formed like the cam diagram of FIG.

A cross-shaped cam arm 19 is pivotally attached to an arm shaft 18 provided on the machine frame 1, and a cam follower 21 axially supported at the tip of a lower arm 19a of the cam arm 19 is a pilot release cam 16 by a tension spring 22. Is in contact with.

[0014] connecting the lifter 24 through the lifter pin 23 at the tip of right arm 19 b of the cam arm 19, the push pin 25 implanted on the lower side of the lifter 24, in screwed a nut 27 to the distal end portion of the yoke 5 It is opposed to the locked release bolt 26 at a lower position while keeping a predetermined distance a. This interval a is 250 ° to 35 ° in the cam diagram of FIG.
It is the interval at 0 °. In addition, this push pin 25
Serves as a portion for lifting the yoke of the lifter 24.

A spring support plate 28 is attached to the upper surface of the tip of the yoke with screws 29, and a spring support plate 30 is attached to the lower surface of the lifter 24.
Are fixed with screws 31. Between the adjusting bolt 32 screwed to the spring supporting plate 28 and the spring supporting plate 30, a compression coil spring is provided.
The spring 33 is attached, and after adjusting the elasticity of the spring 33, the nut 34 is locked. This spring 3
The elastic force P ₂ of 3 is smaller than the elastic force P _{1 of the} spring 13 , and more specifically, the spring 3
The elasticity P ₂ of 3 is increased by the upward movement of the lifter 24.
Between the shoe pin 25 and the release bolt 26 of the yoke 5
Even when the distance a in
Less than elastic force P _{1 of} spring 13
It has great elasticity. Reference numeral 35 is a support pin for the spring 33.

Reference numeral 37 is an air cylinder that pushes the yoke 5 upward against the bias of the spring rod 10 to separate the upper roll 7 from the lower roll 3.

The operation of the roll feeder 40 constructed as above will be described with reference to the cam diagram of FIG.

While the pilot release cam 16 rotating in synchronization with the crankshaft rotates in the range of 350 ° to 80 °, the lifter 24 rises and the distance a between the push pin 25 and the relief bolt 26 becomes smaller. Go, 80 ° ~ 15
The interval a is almost 0 during 0 °. During this time, since the spring 33 is compressed, P ₂ increases and P ₂ increases.
_{Since 1−} P ₂ becomes smaller, the pressing force for pressing the upper roll 7 against the lower roll 3 becomes weaker.

Then, the push pin pushes up the relief bolt 26 between 150 ° and 180 ° to separate the upper roll 7 from the lower roll 3 to release the clamping of the material W.
Return to the interval a between ° and 250 °. A strong pressing force of the upper roll 7 acts on the lower roll 3 at an interval a between 250 ° and 350 °, and strongly holds the material W.

The roll feeder 40 is usually 270 ° to
Since the lower roll 3 rotates for 90 ° to feed the material W for a predetermined length, the material W is strongly pinched at the beginning of feeding and weakly pinched at the end of feeding. Therefore, if the tip of the delivered material (the part where the product was cut off by the previous press work) is brought into contact with the stopper of the die with stopper (upper die), the material will slip at the end of the feed and the feed amount will be constant. become. For example, it is possible to keep the product size variation within ± 0,01 mm or less by setting the feed amount of the upper and lower rolls to 0 to 0.1 mm and causing a maximum slip of about 0.1 mm.

[0021]

As described above, in the roll feeder of the present invention, the pressing force of the upper roll is changed to pinch and feed the material. Therefore, the feed amount of the material without pin holes for a predetermined length is increased. Can be accurate. Therefore, it is possible to use a material without pin holes for highly accurate press working, the material to be discarded can be significantly reduced, and the cost of the press working can be reduced.

[Brief description of drawings]

FIG. 1 is a front view of a roll feeder showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is an enlarged front view of a tip portion of a yoke.

FIG. 4 is an example of a cam diagram of a pilot release cam.

[Explanation of symbols]

 1 Machine frame 3 Lower roll 5 Yoke 7 Upper roll 10 Spring rod 13 Spring 16 Pilot release cam 24 Lifter 33 Spring 40 Roll feeder

Claims (1)

[Scope of utility model registration request] 1. A yoke , which rotatably supports an upper roll for sandwiching and feeding a material with a lower roll and pivotally supported by a machine frame, and the upper roll to the lower roll. Pressed
Spring to urge the yoke downward to force it
And a pilot release cam attached to the drive shaft that rotates in synchronization with the crankshaft , move up and down ,
Roll made with a, and the lifter to push up the serial York
A pressing device of the upper roll in the feeder, the
The lifted portion of the lifter yoke is below the tip of the yoke.
The lifter yoke pushers , which are spaced apart from each other.
Between the upper part and the tip side of the yoke, the lifter
Due to the upward movement, there is no gap between the yoke and the tip side.
Don't lift the tip of the yoke even when
Una, compression coil of elasticity weaker than that of the spring
An upper roll pressing device in a roll feeder , wherein a spring composed of a spring is mounted.